PC sometimes fails to post or wake from sleep

November 13, 2010 at 02:30:55
Specs: Windows Vista 64 Bit, Quad 2.4Ghz P4, 8gb DDR
Quite simply;

If I try to wake up the PC from sleep within 2 minutes of putting it to sleep, it will fail to wake properly 100% of the time (lights and fans come back on, but no signal to monitor or AFAIK any processes running etc)

If I try to boot the PC after shutting it down, it will fail to POST around 1 time in every 3 - regardless of when it was shut down (if it's been shut down for 3 minutes or 3 weeks doesn't seem to affect whether it will POST or not). No POST beep is made, nor any error beeps. At no point does the monitor receive signal, and not all the fans start.

Once the PC is working, it doesn't fail - when I've been in Windows etc, it doesn't get hardware issues or crash or anything - it's just waking from sleep too soon or sometimes booting up from shut down!

As I'm sure you can imagine, this is hugely inconvenient, and I can't afford to replace the machine! I've been told in general chit-chat that this is probably a power supply issue, but any help from the experts on here would be hugely appreciated.

Thanks in advance,


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November 13, 2010 at 03:38:25
Might help if you provided details of system component make/model numbers, particularly the powersupply and motherboard and what if any graphics card/s you are running.

Goin' Fishin' (Some day)

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November 13, 2010 at 08:27:32
Hope this helps Richard - it's a custom build:

Processor (CPU)
Intel® Core™2 Quad Q9450 (4 X 2.66GHz) 1333MHz FSB/12MB L2 Cache
ASUS® P5Q: DDR2, SATAII, PCI-e x16, 3 PCI, 2 x PCI-e x1
Memory (RAM)
Graphics Card
512MB RADEON HD 4870 PCI Express
Memory (HDD)
Power Supply
700W Quiet Quad Rail PSU

If you think any further information is needed please just ask!

Thanks again for your help.

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November 16, 2010 at 05:15:08
The problem seems to be getting worse, with the PC failing to boot more often than not now. Are there any tests or software I can run to try and find out specifically which piece of hardware is causing this?


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