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Computer just shut off. Wont turn on. Dead PSU?

post #1 of 14
Thread Starter 
Ok so here is the scenario, I need everyones help to get me to a conclusion, because I'm just to unsure. So I'm in the process of rebuilding my desktop and its pretty much done, the only things I haven't really touched are the case and PSU.

Now, the graphics card I have is the sapphire ATI HD Radeon 6870, and its a little overclocked. The manufacture says I need at least a 500w power supply. I'm too lazy to check exactly what my old PSU is, but its about 4 years old, I know it was cheap, and I can almost guarantee its under 400w.

I have a 960t over clocked as well, so I'm drawing in a good amount of power. The computer has been running stable for almost 2 months, not a single problem. Playing games almost all day everyday under pretty high amounts of load. Its put to sleep at night and is rarely turned off.

Here is the problem. This evening while playing Just Cause 2 and running a few background applications, not that much imo. It just turns off. No warning. Nothing. just cold turkey off. Green light on the case is still on, no moving parts though. It won't start back up. Then theres a faint smell of something burning in the air? and then it passes.

Unplugged power. Unplugged 24 and 8 plug to mobo. replugged everything. Won't turn on, the mobo light comes on for less than half a second and then goes off, nothing happens. Power is completely unresponsive.

I checked the mobo carefully, there are no blown capacitors, so i don't think anything on the mobo is ruined, cpu and gpu look good. The PSU though, I believe is the culprit.

What is everybody's thoughts?!

Sorry if thats a lot to read, i just would hate to add info in comments later on, so i tried to get it all there^

Thanks,

Greg
post #2 of 14
i know that when i had that problem, it was my mobo. the first couple of times, resetting the jumper helped. but after that, i had to rma.

best way to find out though is to test it with another psu. likely one more suitable to your system's needs. lol.
    
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post #3 of 14
Try clearing the CMOS
The Trooper
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post #4 of 14
If you can smell something burning, and you know it's a cheap Power Supply, I can 99% Garuantee it's the PSU. Just get a 500W Antec Green or something for cheap and throw that in there, and you'll be right. thumb.gif

The only other thing I can think of is one of the components failing and the PC shuts it self off for safety or something like that?
post #5 of 14
From what you mentioned about the power supply, I think you answered your own question within your statement.

Get a new power supply and I bet your PC comes back to life.
post #6 of 14
It's either the mobo or the PSU. Did you take a whiff of the PSU yet?
post #7 of 14
My Corsair HX650 did the same thing. It was the power supply. Stick a paperclip in the on switch wire and a ground wire on your PSU 24 pin connector and see if it comes on. That should tell you if the PSU is bad. I know on my Corsair it was the green wire. I am not sure if that is the same across all PSUs though. The PSU manufacturer website will probably have this info.
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post #8 of 14
Thread Starter 
The PSU doesnt smell burnt exactly, but rather odd. The mobo I forgot to mention is also new. Its a MSI 970 ga 45
post #9 of 14
Quote:
Originally Posted by siryak View Post

My Corsair HX650 did the same thing. It was the power supply. Stick a paperclip in the on switch wire and a ground wire on your PSU 24 pin connector and see if it comes on. That should tell you if the PSU is bad. I know on my Corsair it was the green wire. I am not sure if that is the same across all PSUs though. The PSU manufacturer website will probably have this info.

i believe mine was green as well.
    
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WD 2tb green corsair force 3 HP dvd 1270t HP dvd 1040e 
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post #10 of 14
I've had the same situation happen to me, and 90% of the time it's the PSU. Other 10% of the time it's the mobo. Go with the simplest and most logical choice first, PSU. If you order a new PSU and it's not that, then at least you have an upgraded part off the list biggrin.gif
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