Power supply dying?

[plethora87]

Hello,

I'm trying to determine if my power supply is dying, or if maybe it's a motherboard issue.

I returned home from a vacation yesterday, which meant my computer was off for a few days (typically it runs 24/7). When I went to turn it on, it came on for a second and turned off. This happened a few more times, until finally it booted up.

It was fine until a short while ago when it randomly shut off. Then I had the same problem turning it on again.

I don't have a spare power supply or motherboard to test with. Which do you think is the most likely culprit?

Thanks!

Edit: BTW, the PS is 2.5 years old (PC Power and Cooling S75QB)

 

[R4in]

Do you get any random beeps when you try to turn it on? Outside the normal booting beeps that is.

 

[lehtv]

And is your system overclocked?

 

[plethora87]

No and no. It just comes on for a second (or less), then turns off.

I have several hard drives in the system, so perhaps it's the draw of the initial spin-up. But everything has worked fine for the 2.5 years I've had the PS.

 

[lehtv]

Could be either the mobo or PSU, really. Impossible to say for sure without any spare part to test with. Is it not possible to borrow a PSU from a friend?