monitors turns itself off, weirdness

Hi
What do you think about this one? XP Home on a HP Pavilion 533w. Recently the monitor has started shutting itself off at random times. Just started up last week. Usually after 5-15 minutes in windows, the monitor simply turns off.

It happens with different monitors so I think its got to be something in the box.

I tried a factory reset (I tapped F10 at boot up, then I chosen Format and reinstall.) It gets me a few minutes into XP setup, then the "crash" again.

To me, I think this must be a hardware thing because I did the recovery and formatted the old harddrive. That makes me think we've ruled out virus/spyware. What are your thoughts? Anybody else have a different perspective on this one? Or any ideas?
Thanks

 

Well does the monitor lose power? Or just stop reciving a signal??

 

The light on it goes from green to yellow. I assume this means loss of signal. Also, it did the same thing with different monitors. Also, num lock and caps lock don't do anything after this happens. Think it could be the mobo? I also tried it with a replace video card and it does the same thing.

 

Do the fans stop spinning inside the case?

 

Well I opened the case and watched it go. It seems to be crashing right as it goes into windows - and when the monitor stopped, so did the cpu fan and the caps and numlock keys. As well as case fan. The power supply fan stayed on.

 

Looks like it has to do with the processor overheating maybe. Computers have a fail-safe that stops it from overheating. Go into your BIOS and watch the temperature for a minute or 2. If not, it could have to do something with your power supply dieing out when it shouldn't. Not that great advice but its a start. Pay more attention to other people's advice.

 

i had a similar problem that was caused by a ram stick going bad. monitor went to sleep and had to shut off at power supply.may try only using 1 stick of ram if you have 2 or try borrowing from a friend and trying theirs.Hope that helps

 

Thing that keeps getting me is: It will run indefinately in Dos, but crashes immediately in Windows. Seems like its got to be some sort of bad boot sector or something...

 

So what exactly is it doing or not doing, and do you have a Windows CD?