Computer turns on then instantly turns off

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Bueller2000

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Jul 3, 2016
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So a few days ago I was playing a game and then my computer screen froze and my computer wouldn't turn off until I unplugged the power supply from my wall. So when I plugged it back in it wouldn't turn on at all so I took everything apart and put it back together and it would turn on for .5-1 seconds and shut off. So I checked the power supply and it turns out it isn't that so I'm not sure what it is.

Specs:

CPU : Intel i3 4150
Motherboard : MSI Z97-G45
Video Card : GeForce GTX 760
Power Supply : Capstone-750
Memory : Corsair Vengence
HDD : Seagate 1000GB
Case : Rosewill challenger
 
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clutchc

clutchc

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Apr 22, 2009
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That simply proves that the PSU permissive circuit is working, and that the PSU can produce the correct voltages with no load on it. The PSU could still be the culprit.
 
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Bueller2000

Commendable
Jul 3, 2016
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Also whenever I have my cpu in the socket and I turn my computer on it turns on for .5 to 1 second but then when I take the cpu out it turns the fans on and the leds on
 
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clutchc

clutchc

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Apr 22, 2009
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The only way I know is to start swapping out parts until you find the bad one. Could be a HDD, gfx card, m/b, etc that is causing the issue.
The Capstone PSU is a decent choice, but any unit can go bad. However, I suspect the problem is elsewhere. You might try unplugging the HDD and see if the unit will stay on and reach BIOS.
If that doesn't fix it, try removing the gfx card. See if that keeps the PC running.
 
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Bueller2000

Commendable
Jul 3, 2016
7
0
1,510
When I take out the HDD it does the same thing, same thing with the graphics card and memory but when I take out the cpu the fans run and leds turn on but when I put it back in it shuts right off, the pins in the cpu socket are all straight so is there any way to tell if it's the cpu or motherboard
 
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clutchc

clutchc

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Not w/o swapping out either board or CPU. Or trying those parts in another PC.

But... are you sure you put everything back as it should be? Wiring correct? Board not sitting on an unused standoff? No pinched wiring?

You can try bread-boarding. Remove the board from the case and set it on an insulated surface... connect just the CPU/cooler, one stick of RAM in the slot required for a single stick, the monitor to on-board video, and the keyboard. Start the system by momentarily shorting the two pins that the power button would connect to. If the problem still exists, I'd suspect the board.
 
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