First place to check is the Event Viewer for error messages pertaining to the event. 
 If it indicates that an unknown event took place and Windows has restarted, or if 
there is no reference to anything between the hang and the restart times, you have 
a hardware issue.  It could be heat or a bad PSU and, other pieces of hardware, either 
on or seperate from the motherboard.  The processor has to be running for an event 
to be logged or a BSOD to be displayed.  If the processor or other critical hardware 
items are halted for any reason, then nothing can be written or displayed, and this 
is usually due to hardware/power/heat issues.  One of the possible symptoms is bad 
capacitors on the motherboard so it may be worth a close look at them to see if they 
are leaking.

One of many articles with pictures just in the outside chance you may have this problem. 
 Not a new one on this forum believe me..

http://www.pcstats.com/articleview.cfm?articleID=195







On Monday, November 12, 2007 at 2:43 pm, sekar wrote:

>My windows 2000 desktop all the sudden acts strange. Once I boot the computer, I 

>can use it for 20 to 40 mins, all the sudden monitor switches off and CPU dosen't 

>respond. CPU power light is still ON. I had to switch off the power supply and have 

>to reboot. Again, thing continues.....Please advise. Thanks. 

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