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I had a computer that was working fine for over a year, then suddenly it started to shut off, it got so bad that I press the power button and in around 30 seconds while booting Windows it would shut off, then 20 seconds, then 10, then it refused to start all together.

So I bought a new PSU (850 W Thermaltake, the old one was a 550 W Corsair) thinking that was the problem. I fitted the new PSU now and it's the same thing - I press the power button and my fans start for a split second (they have LED lights on them, so the lights come on) and then everything goes off again.

I thought maybe it was my power button that was loose on my computer. Luckily I had another chassis nearby so I disconnected the power switch from the old one and put in the switch from the new chassis. But when I pressed the power on the new chassis, it's same thing, it blinks for a split second and turns off again.

Double checked connections from the PSU to the CPU power as well as motherboard power, it's tight. It's pretty unlikely both the PSUs have the same exact problem so I am lost.

Any suggestions?

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Have you checked that the heat sink and fan hasn't come loose from your CPU? It could be shutting down as quickly as it overheats. –  Nicole Hamilton Dec 15 '12 at 22:06
    
Does not look like it, seems to be on pretty hard. Even then wont it take more than a second? This is going off in milliseconds... –  Ryan Dec 15 '12 at 22:09
    
Do you have any bulging capacitors? If you are not getting a POST, it could be that, or your motherboard got fried. –  Colum Dec 15 '12 at 22:12
    
My mobo is a p67 Extreme 7, all metal capacitors so had to google to see how the look when they bulge... as far as I can see, no bulge. But something mew, now when I press the power not even the fans move slightly, absolutely no effect :( –  Ryan Dec 15 '12 at 22:21
    
Cab't find anything, I guess the MOBO is fried as my sis says she smelled something burning a few days back and it smelled like burning wires... :( –  Ryan Dec 15 '12 at 22:35
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1 Answer

up vote 2 down vote accepted

How about checking for other loose connections?

Also, try disconnecting as much as you can (but still having a potentially working PC).

Remove all but one RAM chip. Play with different combinations etc.

It could be overheating, so check that all colling systems, fans, heat sinks are ok.

If the PC works with hardware removed, then add components one by one until you find a fault.

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Took out 3 of 4 RAM sticks... will continue disconnecting... –  Ryan Dec 15 '12 at 22:21
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Nothing found, but your answer is the only one and makes sense so will pick it... –  Ryan Dec 15 '12 at 22:36
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