HP pavillion a5040a Desktop - CPU fan constantly on and goes into sleep mode randomly after PSU replacement

I have a customer who reported no power to their 2 year old HP pavillion a5040a desktop PC.
I installed a new PSU, and the machine started fine and booted up to Vista
The only problem was the fan was constantly on and the machine randomly went into sleep mode - sometimes after vista had booted, but sometimes when i tried to enter bios, sometimes after a few seconds sometimes after 10minutes. The machines blue power light on top of the tower turns orange and it will not come out of that mode by pressing any buttons , mouse etc
I have to hard cut the power and reboot - when i do it comes up with vista repair screen because it wasnt shut down properly
I checked the CPU temperature it was 48c
I couldnt see any fan control or sleep mode controls in the bios
not sure what to try next...
AffordableComputersAsked:
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lauchangkwangCommented:
>> I couldnt see any fan control or sleep mode controls in the bios  ....... not sure what to try next...

try restore it to Factory Default , then all the setting will be go back to Factory default ....... also try to untick the Hibernation ..... Hope this help ....
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lauchangkwangCommented:
>> sometimes after vista had booted, but sometimes when i tried to enter bios, sometimes after a few seconds sometimes after 10minutes.

If you mean cannot get any display after that, i would suspect the Graphic Card / motherboard with integrated graphic having some problems ...... Does the monitor showing green light or yellow light if there is no display but the PSU fan keep running ?? I guess the answer is yellow light .......
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nobusCommented:
can be you have bad caps, as per www.badcaps.net
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AffordableComputersAuthor Commented:
turns out it was PSU - I put a better quality PSU in and the fan returned to normal speed and no more sleep mode
Thanks to everyone for the suggestions and I hope this helps somebody else
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