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System won't turn on at all...dead PSU?

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Last response: in Systems
December 25, 2011 6:55:07 AM

Today, before the holiday festivities, my boyfriend was using his computer and used Windows to shut it down before he left. But when we returned, nothing starts. No system fans come on. No LEDs. There's no sign of power.

I'm not sure how a cable would become unattached to the motherboard/PSU internally since nobody touched the computer after we left.

I'm assuming it is the PSU since the system shows no signs of life at all, but someone may have a unique experience or there may be something else I am missing.

I built my boyfriend's computer 3 years ago, here are the components:

CPU: Intel Core 2 Duo E8500
GPU: Sapphire ATI Radeon HD4850
PSU: OCZ ModXStream Pro 700W
Seagate 500GB HDD
Seagate 300GB HDD
RAM: 2x 2GB Corsair XMS2
Windows 7


Shut down with Windows, now computer won't start at all (no fans, lights, etc.), suspect borked PSU. Thoughts?

Thanks for the help!

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Best solution

a c 78 B Homebuilt system
December 25, 2011 8:28:17 AM

PSUs do tend to reach the end of their life pretty often in the 3 - 5 year range so that is a strike against the PSU.

Do you have a PSU in your computer you could put into his one?

It certainly sounds like a PSU issue.

ModXtreme PSUs were formerly built by Topower so if you have one of the ones from that OEM then that would be another strike against the PSU.

I would definitely try to switch that out first before doing much of anything else if it were me.

You could try the PSU in my signature XFX Pro 650w Core if you are getting a new one. It is made by Seasonic which is the best OEM and it usually has a very good MIR attached which makes the cost very reasonable.
a b B Homebuilt system
December 25, 2011 11:32:33 AM

This is a good reference.

Start by checking power to wall socket. The check power to PSU. Then bypass PC on/off switch using technique in reference above. Last step before buying new PSU is bread-boarding old PSU with a MB you have lying around to rule out a short in your current PC stopping PSU.
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January 4, 2012 7:20:08 PM

Hey, It's Olympia, the thread OP.

It was the PSU, I replaced it today everything boots perfectly. Well, I got a Chassis Invasion Error, (Asus! :fou:  ), but other than that everything is normal!

Thanks for the help guys!
a c 78 B Homebuilt system
January 4, 2012 7:23:45 PM

Glad to assist.
January 12, 2012 8:57:43 PM

Best answer selected by Olympia_88.