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Computer won't power on

post #1 of 7
Thread Starter 
I was in the middle of playing a game and all of a sudden my PC turned off. No warning or error. So I hit the power button again and it turned back on for about 2 seconds and then turned back off. I tested the PSU by doing the paper clip trick and the PSU fan turned on. My motherboards power and reset buttons are also lit. I've tried taking out ram, clearing cmos, etc. No beeps, doesn't even turn on.

Any ideas?
post #2 of 7
Yes unplug your power cord form the PSU and press the start bottom on the case lots of times untill you are sure all the power is out of the PC

That have worked for me before
Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
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Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
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Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
AudioAudioOtherOther
Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
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post #3 of 7
Thread Starter 
Nope. Still not working
post #4 of 7
    If the PSU works, but the motherboard won't turn it on (no response at all from the power button), my guess is that the motherboard is done. mad.gif I have not yet experienced any computer that has recovered from this.  Just two days ago I replaced one that did this after a very close lightning strike.  It was fully surge protected (by a Belkin UPS that has a $100,000 guarantee [that's another ridiculous story]); and the PSU, CPU, HDDs and memory all work, but the motherboard just won't respond to the power button.

    If the computer still turns on for two seconds when you press the power button, I would test the PSU's voltages with a digital multimeter to verify that they are good.  Try reseating the power connections to the motherboard (the 24 pin ATX and the 4 pin CPU connectors).  Try removing the CPU and see if the computer behaves the same way.
My desktop PC
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770K Gigabyte P67A-D3-B3 NVIDIA GeForce 8400 GS  1x Corsair 8 GB 
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Kingston SV300S3 WesternDigital WD10EZEX Samsung HD154UI Windows 7 Ultimate SP1 x64 
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Daewoo L947BK Gateway FPD1530 HTK-2001 Dynex DX-400WPS 
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Kensington K72400 Realtek ALC889 
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My desktop PC
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770K Gigabyte P67A-D3-B3 NVIDIA GeForce 8400 GS  1x Corsair 8 GB 
Hard DriveHard DriveHard DriveOS
Kingston SV300S3 WesternDigital WD10EZEX Samsung HD154UI Windows 7 Ultimate SP1 x64 
MonitorMonitorKeyboardPower
Daewoo L947BK Gateway FPD1530 HTK-2001 Dynex DX-400WPS 
MouseAudio
Kensington K72400 Realtek ALC889 
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post #5 of 7
Thread Starter 
Well I decided to let it sit for a day or so and see if it fixed itself if it was a short. And today it is working. At least if it happens again I'll have an idea of what it is. Thanks
post #6 of 7
Thread Starter 
Well it decided to do this again so I took everything apart and put it all back together and still not turning back on. Should I start sending parts back in and getting them replaced? I honestly don't know what else it can be.
post #7 of 7
Can you do the PSU paperclip test with a multimeter? Because if even one of the positive voltages is out of wack, the motherboard won't work. If you don't have a multimeter (anything digital is fine, even the $3 - $7 ones from Harbor Freight), try plugging in a USB device that lights up, like most flash drive sticks or a mouse because both run off the +5V. A hard disk or optical disk uses +12V and +5V and won't spin without both voltages being pretty close to specs. OTOH I don't know how to check the +3.3V without using a meter.

I think there's a short, either between the motherboard and case or because a capacitor blew or a MOSFET shorted. Hope it's the former, and inspect around the mounting holes (top and bottom) and the corners. Any corner not supported within 2" can bend enough to short to the case, but taping cardboard to the case can prevent that.

If you try the motherboard outside the case, be sure to place it over a non-metal, anti-static surface. The sheet of foam that comes with motherboards is fine, as is pink anti-static bubble wrap, but don't place the mobo on a transparent metalized anti-static bag because it's usually anti-static only inside. If you have none of those materials, use wood, Formica, or a 1/2" thick layer of non-shiney paper, like newspaper or paper grocery bags.
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