How to Use Two Power Supply for one PC. Thanks for contributing an answer to Electrical Engineering Stack Exchange! I got a pretty simple problem: I plug in the PSU's 24-pin & 8-pin cables onto a new motherboard, and the PSU does not turn on. If the fan works, this does not mean the motherboard is "turning on." This is an ATX Power Supply for a … Open | Hardware. My first guess was the PSU. - try to remove the power cord from the PSU and leave it unconnected for say 10-20min (objective is to drain any residue charges from the PSU capacitors). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The SMPS turned on properly with its fan running. How does steel deteriorate in translunar space? I had a PSU in which the fan would turn on, and sometimes boot up … Is the energy of an orbital dependent on temperature? It was working fine till yesterday evening, but from this morning, it won't turn on. If I unplug the PSU, wait for the motherboard to lose power and then plug it … My first guess was the PSU. Issue: When I turn on the computer, the LED lights on the mobo (brand new Gigabyte EP43-UD3L) will "flicker". I'm not sure if I can conclude that the power supply is defective or if there is possibly some other problem that might be causing this behavior. by sheldontraceySWT123 Feb 5, 2010 9:57AM PST Since the power has to go through the mother board … JavaScript is disabled. rev 2020.12.3.38123, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Building a source of passive income: How can I start? Did I short circuit the motherboard or PSU? Last night the old PSU was firing up just fine, but cutting out whenever the load presumably got too much. However, the PSU won't spin and the PC won't turn on at all with the power button. There are cases when mainboard chipset ICs die gradually, due to development of some internal faults. If the fan works, this does not mean the motherboard is "turning on." Everything powers on, windows installed. Is it bad to load one rail of a power supply vastly more than the other? I also tried to manually turn (short PS_ON and COM) on the suspected PSU but it turned on. The whole thing behind the "paperclip trick" is to allow you to turn on your power supply (PSU) without plugging it into the motherboard and pushing the power button in front of your computer. Today, I … In other words, remove … I bought a brand new psu and still the same (A waste of $100) it did not fix it. Everything powers on, windows installed. Adding more water for longer working time for 5 minute joint compound? Okay, we know you are getting power as the RAM RGB lights come on....I think you should remove the cooling system and reinstall the CPU just to make sure.. Try this: Make sure all power connections are connected to the motherboard… I plugged everything in and when I turn on the power supply, I see a solid orange LED and a blinking green LED on the motherboard. (By this, I mean that it is not even starting the boot; the fan on the processor won't run.) Product repair questions are generally off-topic here unless a thorough understanding of the circuit being repaired has narrowed them to a very specific technical question. This includes the … Plug your tablet, laptop, or desktop directly into the wall if it's not already. You need to do some investigative work. Use a piece of wire or a metal paperclip to connect the pin connected to the green wire in the 24-pin ATX connector with one of the black ground wires. Most case switches are connected to the motherboard via a red and black twisted pair of wires. When the PSU is connected to the GPU, the entire PC will flash, but not power on. My laptop battery not working now after i fixed power supply. I did read on onother thread that someone had the same issue as yours but when he took everything of and re-installed the CPU it worked fine..worth trying.. You must log in or register to reply here. However, the PSU will not turn on once I connect the motherboard. How can I avoid overuse of words like "however" and "therefore" in academic writing? The light on the motherboard is probably just a 5 v LED. I have the HDMI connected to the motherboard and everything works ok when the GPU is NOT connected to the PSU. I am looking at a power supply for this but I can only find one with a 12v eatx 8 + 4 cable is a Corsair ax860. The paperclip test doesn't test under load. Are there ideal opamps that exist in the real world? Physicists adding 3 decimals to the fine structure constant is a big accomplishment. Similar way you need to check all other rails, +12V, +5V, and +3.3V. The PSU needs a connection to the motherboard to be told to turn on. Come back and it just won't turn on. I have an HP Media Center m1264n desktop that shut down randomly while I … You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires. There could be to only two outcomes: either your PSU is faulty, or mainboard, part of it. U can try pressing the ON button either from the casing or motherboard simultaneously "together" with the PSU ON/OFF button (at the back of the PSU) and somehow it will kick start the motherboard/CPU after a while (like pressing ON/OFF ON/OFF ON/OFF at the PSU together with the on button at the casing) Troubleshooting. If you don't see any light there, it can mean that cables are not connected properly anymore, or that the power supply or motherboard are dead. How to draw a seven point star with one path in Adobe Illustrator, Positional chess understanding in the early game. The "Paperclip Trick" is used to test the power supply by turning on the fan. The secondary computer does not boot when the gpu is plugged into to the pci-e port and is connected to the power supply. I connected the PSU only and still nothing, the CPU fan wouldn't even spin. PSU work when using jump plug, I tested my water-cooling system. If you turn on your PC the PSU shouldn't make a click noise. Why? I Build a new computer with water cooling system. Is it worth trying to fix an ATX power supply? After it shuts off I still get the green power lights but it still won't turn … Can a fluid approach the speed of light according to the equation of continuity? As I said, today the old PSU get's me about half a second of the power light coming on and that's all. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Need help. To TS: one simple test to try out if it is indeed the PSU that is the main culprit. Or buy a brand-new computer. Find the green wire (see the diagram below, it is labelled PS_ON#). I want to be sure it's the Power Supply but want to be positive before dishing out another $200. by Marc.W. Computer won't start when ATX12V is connected - posted in Internal Hardware: Hello, thanks for your time. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Firstly turn the PSU off at the wall. The "Paperclip Trick" is used to test the power supply by turning on the fan. Yet, when I connect the motherboard connector into the motherboard, the computer doesnt turn on at all- no psu fans no nothing. PSU is "fine", powers on with paper clip test (doesn't mean it's stable though) Disconnected unnecessary components, tried using the motherboard's own power and reset buttons (Only 24-pin ATX connector and 8 pin ATX12V cpu power connector connected) Tried shorting the mobo PW switch with a screwdriver (+tested with a multimeter, it's ok) Rams are good and power supply is ok. Where is the problem please. But now, my PC has power to the mobo and won't turn on when I push the on button on my case. When I connected it all, then shorted the 24pin, everything turns on, but when the 24pin is connected to the motherboard, nothing turns on. Something is connected incorrectly, or something has failed, such as a power supply. The led light on motherboard is at green so it should be receiving power from psu but when i pressed the front panel switch to turn on and nothing happens. PSU works, when 24 pin connected to motherboard, PSU doesn't turn on. Use MathJax to format equations. At first, this was only occasional and did not happen every day. The motherboard indicates with an LED light usually if it gets power. I used a multimeter and all 24 pins showed the proper voltage. When the PSU is connected to the GPU, the entire PC will flash, but not power on. Good: Assume that any current power supply will work with any current-generation motherboard, and spend you effort worrying about whether your power supply is will support your CPU and graphics card. When this “jump” is broken, the PSU shuts off. I have also verified that when the motherboard is powered, the power-on pin voltage on the motherboard drops low when the server power button is pressed. The new PSU works fine prior to installation in testing. To learn more, see our tips on writing great answers. In both cases the repairs are un-economical, so be best course of action is to determine which part is at fault and replace it. It's really very simple. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The led light on motherboard is at green so it should be receiving power from psu but when i pressed the front panel switch to turn on and nothing happens. When you press the power button on your case, it jumps the green wire to a ground, telling the PSU to turn on. MathJax reference. This will now be the switch to turn your power supply on and off... First of all, find a paperclip and bend it to something like the picture below. Why is the TV show "Tehran" filmed in Athens? The new PSU doesn't even give me … PSU = Corsair HX850 that I've had for 5ish+ years (for the majority of that time it ran an OC'd i7 860, full water loop, multiple hard drives and a GTX570) Motherboard = Asus Maximus VI Hero that I've had for less then a year I don't have a paperclip to try the PSU thing (never tried it before anyways). I checked all the cable to that connected to the motherboard, everything … It only takes a minute to sign up. Come back and it just won't turn on. Are the natural weapon attacks of a druid in Wild Shape magical? How to Turn on a Computer Power Supply Without a Computer: Computer powers supplies are readily available and make a good 12 volt or 5 volt power supply. New PSU is plugged in Motherboard but won't turn on - posted in System Building and Upgrading: I recently started building a PC using entirely new parts, save for the case. CPU power supply for MSI B450 Tomahawk Max. ).After having a play around the PSU cables, I realised the PC would only power on when the 8-pin wasn't plugged into the motherboard. That is a £200 power supply ... Is there a cable that I can use that can connect in to a modular psi for example to save a wedge of cash or will I have to buy a £200 psu? Cpu fan spin but there is no power led light and hdd power led on. First rail to check is the +5VSB standby voltage, it should hold at least 2 A of load (use a resistor of about 2.5 - 3 Ohms, like this one). My first step--given that the supermicro guys say 1-stick should work--would be to use the PSU in a known-good computer to rule out a PSU problem. I am troubleshooting a problem with a power supply for an HP EX490 Mediasmart server. Two interpretations of implication in categorical logic? Monitor and all usb devices loose power/signal for a second. Yea, its connected to a surge suppressor. That doesn't mean your PSU is good as it must provide several different voltages at sufficient current for the PC to work. Ok I bought an OCZ stealthXStream 600w PSU and it does not turn on my motherboard nor my other motherboard I have which is intel. Did they allow smoking in the USA Courts in 1960s? I have an old alienware system that has a PSU in it but it's not modular and is connected to so many random things in that case that it would be quite a pain to get it out to check. PSU = Corsair HX850 that I've had for 5ish+ years (for the majority of that time it ran an OC'd i7 860, full water loop, multiple hard drives and a GTX570) Motherboard = Asus Maximus VI Hero that I've had for less then a year I don't have a paperclip to try the PSU thing (never tried it before anyways). (By this, I mean that it is not even starting the boot; the fan on the processor won't run.) site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. The PC would power on for a few seconds and immediately power off so I jumped the PSU and luckily it was okay (I think? I don't have my processor, ram, or hard drive yet. PSU is a Corsair VS550, motherboard is an ASUS H81-PLUS. It was working well until I unplugged and plugged back in the cord connecting the motherboard to the PSU. I tried removing the drives and 1 memory module and nothing. The CPU fan spun right up so I know that the motherboard isn't broken. Asking for help, clarification, or responding to other answers. With the power supply connected to the motherboard I have tried shorting the green wire to ground at the connector, but the supply doesn't turn on. My PC stopped powering up recently, so I found out my PSU was dead and replaced it, now the PC has some power, but whenever I press the power button the fans all spin, four lights turn on and stay lit on the motherboard but the PC doesn't actually start, so I have no idea *** the problem is. This is my first build using X10SLL-F-O and Pentium G3220. I plugged in the monitor and it says no signal. Hook up a fan or a junky HD. I grabbed a spare PSU and connected it to just the motherboard. I mean his power supply ran perfectly on my pc's at home so I know thats not the problem. There could be to only two outcomes: either your PSU is faulty, or mainboard, part of it. Whenever I try the paperclip test the PSU boots perfect and the PSU top fan begins to spin. Internal Wiring. New PSU, PC won't turn on My sister just got a new PSU for her PC, I put it in, when on the motherboard has a slow blinking green light and nothing else, the CPU's fan doesn't even rev or anything. The next step is to start checking inside your build to ensure that there are no loose … Hi all, Building a brand new system. If these wires aren't securely connected or aren't connected at all, this is probably the cause of your computer not turning on. Short-story or novella version of Roadside Picnic? The second thing is find the 20/24 pin connector that's supposedly used to connect to your motherboard. Tested PSU using paper clip test, turned right on. problem is: When the GPU (EVGA GTX 970) when connected to the PSUs 8pin+4pin my computer wont turn on. It's really very simple. Ignore the extra 4 pins that's with the 24 pin power supplies. I came to a conclusion that the motherboard that has the problem. So I just put together my first build, only for it not to turn on. problem is: When the GPU (EVGA GTX 970) when connected to the PSUs 8pin+4pin my computer wont turn on. nothing else. 3-Digit Narcissistic Numbers Program - Python . The gray wire is really important. ... And I did leave the m.2 SSD in the slot on the motherboard. What does "loose-jointed" mean in this Sherlock Holmes passage? But when I plug the 24 pin connector into the motherboard, none of the lights on the mobo turn on, PSU doesn't turn on, nothing. How to use a NPN-Transistor to get status LEDs for an ATX power supply? How to get around having no signal. When a PSU does what yours is doing it's usually because the PSU is detecting a problem with the motherboard … Therefore, unless your power supply connects to a working motherboard that sends that signal, the power supply will not work. Lightly touch a metal screwdriver to the two power switch header pins, and the system will turn on if everything is connected correctly. This is an ATX Power Supply for a … ATX power supply won't turn on when connected to motherboard, Tips to stay focused and finish your hobby project, Podcast 292: Goodbye to Flash, we’ll see you in Rust, MAINTENANCE WARNING: Possible downtime early morning Dec 2, 4, and 9 UTC…. Fine. Motherboard has power, but PC won't turn on. Full-sized testing of ATX supplies is likely out of reach for you, but you can use power-size wire-wound resistors to load individual rails. Disconnect the PSU completely from the computer and turn off the power switch. Simply removing the psu cables, the pc boots and I get signal to the monitor from the onboard graphics card and it boots to windows just fine. How to Turn on a Computer Power Supply Without a Computer: Computer powers supplies are readily available and make a good 12 volt or 5 volt power supply. But trust the motherboard when it indicates the psu is not the problem. So I unplugged the 24-pin ATX connector, and connected the green and one black terminal. It is pin number 16 on the 24 pin plug (Diagram Below Left) and pin number 14 on the 20 pin plug (Diagram Below Right). Then I tried using the dead machine's PSU to a known-good machine, and the known-good machine worked. Now, the … That sounds as likely to be a short-like fault on the motherboard as a power supply issue. I'm afraid something died and it's now just finding out what. Do you hear fans starting to work inside the PC? You need to do some investigative work. The power supply no longer powers on when the power button is pressed on the back of the server. So for the past 2-3 weeks, my PC has not been powering on. io shield seems to have electricty/static current. Try using the paperclip trick to start the PSU outside of the computer. The light on the motherboard lights up when we hit the PSU switch to on. Fun with LED Matrices on the Pi Cast at 1:30 PM Eastern!! It should go from 0 to +5 volts when you turn the PSU on with the case switch. I just built this computer and as soon as I plug in the psu to the wall outlet, the motherboard and fans turn on, then it suddenly shuts off and I can't turn it back on. The faults can develop either if the IC was run in overheated state for long time (undersized heat management), or some ESD or "brown-out" events caused "electrical fatigue" and the chips started to consume more and more current until they die completely. To test PSU you need not only to power it up with the green-black short, but also to apply some reasonable load. However after connect it to the motherboard psu won't start or no lights coming, However RAM RGB lights turn on. The other problem can be with mainboard itself. they said it was a motherboard problem, due to the fact that the light on the mother board indicated that the power supply was properly distributing power to the system. But get this, I use a paperclip in the PSU in my wall outlet and I plug in a sata HDD and DVD/CD drive, then the fan turns on and as well as the two drives. All of my cables are connected and everything is … Turn ON Power Supply without having it plugged in the MotherBoard. Try this: Make sure all power connections are connected to the motherboard. I have disconnected the power supply from the motherboard and found that it will turn on when I short the green power-on pin to ground. Making statements based on opinion; back them up with references or personal experience. Under normal circumstances, all power supplies (including those with an on and off switch) and their fans turn on due to a signal they receive from the motherboard. You said the light on the motherboard turns on when you flip the switch of the PSU, but then it doesn't do anything at all. Pressing the power button causes the PC to turn on for a second or so before turning off again. The ultimate test would be to test the PSU with the same kind known-good mainboard, loaded with some stress tests. Try hitting the on switch again. It was working fine till yesterday evening, but from this morning, it won't turn on. Why did I measure the magnetic field to vary exponentially with distance? what should i do? Make sure the 4/8 CPU and 24-pin motherboard power cables are connected and that the PSU is switched on and supplying power. To test PSU you need not only to power it up with the green-black short, but also to apply some reasonable load. Panshin's "savage review" of World of Ptavvs. So it's hard to rule out the PSU. I … It is pin number 16 on the 24 pin plug (Diagram Below Left) and pin number 14 on the 20 pin plug (Diagram Below Right). Ok so, I got my motherboard a couple days ago and, I connected my PSU, fans, front panel connectors, and everything else to it, and it doesn't turn on. Find the green wire (see the diagram below, it is labelled PS_ON#). I would say you have the power switch connected in the wrong pins. My Seasonic Focus GX-750 PSU will not turn my motherboard on anymore. Fine. X570 Motherboard Power Supply. How do I get mushroom blocks to drop when mined? So I unplugged the 24-pin ATX connector, and connected the green and one black terminal. If each of these rails holds at least 3 - 4 A of load, your PSU is likely good. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Any suggestions would be welcomed. Whenever I plug in the 24-pin and 8-pin cables from my PSU into my motherboard and turn the PSU the only indication of power I get is the green standby light on my motherboard. The only thing is when they are not connected to a computer you need a way to turn them on. CPU needs this signal to boot. BY *FAR* the most common piece of hardware to be bad is the PSU, especially when put under load the first time. If I unplug the PSU, wait for the motherboard to lose power and then plug it … Pressing the power button causes the PC to turn on for a second or so before turning off again. I then checked the original PSU by shorting out the green wire in the main power conector; the PSU turned on. Therefore, unless your power supply connects to a working motherboard that sends that signal, the power supply will not work. For a better experience, please enable JavaScript in your browser before proceeding. PSU Won't Turn On The Motherboard Anymore. Pc won't boot when occupying PCI x16 slot. Pc can't strart. The second thing is find the 20/24 pin connector that's supposedly used to connect to your motherboard. When I did the shorting trick on the PSU it turns on, so I figured it works. How can I deal with a professor with an all-or-nothing thinking habit? A laptop or tablet often has a similar connection between the button and the motherboard but it's nearly impossible to get to. Firstly turn the PSU off at the wall. The SMPS turned on properly with its fan running. Computer won't start when ATX12V is connected - posted in Internal Hardware: Hello, thanks for your time. Find the green wire (see the diagram below, it is labelled PS_ON#). *motherboard - i tried manually shorting the MB's PW, but still won't turn on. Powering ESP8266 from pc atx power supply, DC motor is pulsing when connected to power supply, ATX power supply doesn't turn off after PS_ON wire is disconnected from GND. So, it seems odd that the power supply will turn on when disconnected from the motherboard, but not when connected. The only thing is when they are not connected to a computer you need a way to turn them on. The motherboard has the problem. What are wrenches called that are just cut out of steel flats? Either way, this pin is the PS_ON sensor that tells the PSU that it's plugged into the motherboard and that it's okay to supply the power. Full-sized testing of ATX supplies is likely out of reach for you, but you can use power-size wire-wound resistors to load individual rails. What i would do is take out the RX 480 and connect your monitor to the iGPU (the ports on the motherboard) and reset the CMOS once more and try again. The green wire on ATX plug is the “power on” line and is pin #14. As long as the 2 small wires from the power-on switch (case front) are attached to the motherboard, and the power supply ATX connecter is attached to the motherboard, the power supply will turn on. I did the paperclip test and it passed- psu fan spins and even the hard drives i left plugged in still turn on. Changed power supply but computerr still won't start. I have the HDMI connected to the motherboard and everything works ok when the GPU is NOT connected to the PSU. I'm not sure but i think that's a security thing in your PSU activating. Users can turn on a power supply without the motherboard by inserting a paperclip into the green and black wire sockets on the 20-24 pin connector. And yes, it's possible for a PSU to fail, and some components of the PSU still work.