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Power supply problem?

Last response: in Components
December 2, 2009 9:03:50 PM

I have a Dell that's a little over 2 years old. The boot HD failed so I replaced it w/a new HD and reinstalled Windows 7. The system boots and runs w/out any problems. However when I shut the system down it powers off then starts to power back on for 1-2 seconds then powers down. It continues to do this until I unplug the power supply. When I plug the power cord back in it doesn't exhibit this behavior. I've checked all the BIOS settings and reinstalled the OS. I haven't installed anything new except the HD.

Has anyone seen anything like this? Could this be a PS problem? I would hate to think that it's a MoBo problem.

More about : power supply problem

a b ) Power supply
December 2, 2009 11:05:13 PM

What PSU do you have?
December 3, 2009 12:39:12 PM

It's a Dimension E520 w/ the standard Dell PSU, I believe it's 350W. I only use the system for development work.
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a b ) Power supply
December 3, 2009 12:46:28 PM

Could be the PSU. Most manufacturer PSU's are not of the high quality sort (though Dell and HP are getting better).

Can you test it with a different PSU?
a c 144 ) Power supply
December 3, 2009 1:21:40 PM

It's either a power supply problem or possibly a problem with power management settings. Remember, you reinstalled the OS on a new HD.
December 3, 2009 6:10:36 PM

After installing the new HD I originally installed Windows Sever 2008 R2 Server Core (Server Core doesn't install the GUI only a command prompt) It was the first time I'd run server core and I thought I that mybe I had screwed something up so I did a full install of Sever 2008 R2 and still had the problem. Thinking it might be an imcompatibility with R2 I wiped the disk and installed Windows 7 (which is what the system was running when the HD failed) and still had the problem. I've checked OS and BIOS power settings and everything looks OK.

I don't have a spare PSU lying around to test with. I'd have to buy one or pull one out of one of my other systems. My concern with doing this is that Dell used to use different pin-outs on their PSU. I'm concerned that I might fry my mobo.
a b ) Power supply
December 3, 2009 10:36:23 PM

A different PSU shouldn't be a problem. Modern motherboards are usually 24 pin (some still 20 pin) and modern PSU's usually have a 20+4 pin power adapter to allow compatibility with either 20 or 24 pin.

True some older Dell's did some weird stuff but the Dimension E520 is beyond that era.
December 4, 2009 12:35:32 AM

Thanks Viper. Your right. It looks like Dell has stopped that non-sense. I searched the Dell support forum and found some posts indicating that the E520 can take a standard ATX PSU.

I guess I'll go get a new PSU tomorrow. Hopefully that'll fix the problem.
December 10, 2009 4:14:02 AM

It turns out the problem was caused by a D-Link DGE-530T network card. Installing the driver for the card fixed the problem.

Thanks for the assistance.
a b ) Power supply
December 10, 2009 4:22:08 AM

Glad to hear you've got it all working again.