No beep, no POST/BIOS and no video.

Asus P5qc desktop motherboard - intel p4...
September 13, 2010 at 03:03:17
Specs: Windows 7, Q9300
PC = Asus P5QC motherboard with a Q9300 CPU, 650w PSU and 4gb DDR3.

PC has been running fine for nearly two years (apart from one format a few months ago due to bad data and to upgrade from Vista to Windows 7) and has been fine lately.

I was watching some BBC iPlayer last Friday and fell asleep with it still on. Woke up and the monitor had gone into standby (orange LED) and I was unable to wake it back up to shut down.

I held the power in for a few seconds to power off and attempted to restart. Powers on normally but doesn't beep at all and the monitor immediately goes back to sleep. All fans seem to work as they should so I cannot determine whether it's my PSU, system board or CPU. When powered on also, it sometimes shuts off after a few seconds only to start up itself again and stay running the fans. The motherboard light is on (green). However, this does not happen every time.

Tonight I'm going to try it with one stick of RAM at a time and also try a spare (albeit only 350w) PSU I have lying about.

Any other suggestions before I start replacing parts, willy nilly?

NB: There have been no hardware changes lately and no major software changes other than installation of a video player that comes with BitComet.

See More: No beep, no POST/BIOS and no video.

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September 13, 2010 at 03:53:46
u didn't mention the v-card. If u have v-card that consume a lot of power u will have a problem with 350w psu. Post the specs of both psu's (+3.3v, +5v, +12v).

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September 13, 2010 at 04:42:37
Apologies. GPU is a Radeon HD3870. Do I need a multimeter to obtain PSU spec? I wont be home until after 5pm but certainly no expert in PSUs.

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September 13, 2010 at 05:05:30
"Do I need a multimeter to obtain PSU spec?"

No, you need to open the case & get the info off the label on the side of the PSU - make/model/wattage plus amperage ratings for the +3.3v, +5v & +12v rails.

If you're not getting any beeps, it's NOT the RAM. It's either the PSU, CPU or motherboard.

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September 13, 2010 at 11:56:39
Hope this is what you were after;

It's still powering off after several seconds of powering on. Can't see any visible obvious hardware faults.

Edit: Forgot to say that it does come on by itself again after the power cuts out. Then it just stays on indefinitely with the fans running but no beeps.

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September 16, 2010 at 08:54:52
Don't suppose there are any other suggestions before I replace, mobo, PSU and CPU one by one, are there?

I'd be happy to answer any more questions that experts might need answering rather than go through the expensive and time-consuming process.

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October 1, 2010 at 04:46:09
Did you fix the problem?
Having exactly the same problem with a similar spec pc.

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