Does this sound like a PSU problem?

[enigma322]

So my computer has been running fine, aside from occasional DOA mobos, for a year now. Yesterday though, my computer would just turn off. I would turn it back on, and it would last for another 5 minutes, then turn off again. The time that it would last would get shorter, and now when I press the power button the fans and everything goes on for like a second or less then turn off.

I don't know what a failing power supply looks like, but this problem seems like the PSU's. Any input would be helpful thanks=)

Its an OCZ 700w, 4 years old.

 

[iam2thecrowe]

check temperatures, if its shutting down something could be overheating. clean all the dust from your fans/heatsinks/psu with compressed air. failing that, yes it could be your psu failing.

 

[enigma322]

I started checking temps after it started shutting down, and they were all in normal range.
And I dusted everything last week.

 

[iam2thecrowe]

a faulty motherboard or any other shorted out component can cause this also. How old is the motherboard? open your case and look for leaking/bulging capacitors.

 

[enigma322]

This mobo is a year and a half. I had it RMA'd 3 times. Though what is happening now hasn't happened before.
Just checked and there were no leaking/bulging capacitors.

 

[calguyhunk]

If you have another PC available at a friend's or a relative's, see if you can use your PSU to boot that PC. You'll prolly get a clearer answer from that as to whether the PSU is the culprit.

By the way sorry for being condescending, but have you added any new component, like a new GPU maybe?

 

[enigma322]

Not condescending at all, I thank you for helping me.
I have been using a wireless card(D-Link DWA-522) from my uncles computer. The problems started a couple days after I started using it, but I removed the wireless card and the problem persisted.
I also unplugged the power to the cd drives, and i took out each piece of ram, one at a time, to test those. But it would always start up for a second, then power down.

 

[calguyhunk]

These things sometimes seem to happen without any apparent rhyme or reason. Will in all probability go away.

If visually all the components look all right (no busted capacitors etc.), unplug all the connections from the PSU and the mobo and re-connect and see if that helps.

Also, as I had said, try and check the PSU out in some other system. If your system ain't OC'ed and the temps are all right as you've mentioned, this really should not be happening for any length of time.