computer shuts down and will not restart unless power is unplugged/plugged back in

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I recently installed my HP desktop with windows 7 (was running Vista w/ svc pak 2)  Everything seems to be working fine but when I come back to my computer after being away for awhile it will be completely powered off (the monitor will be on but in sleep

mode).  When I try to restart I get nothing.  I unplug the power source from the wall, wait 10 seconds and plug back in.  Only after doing this will the power on the tower boot back up.  I have tried all I can thing of and time after time after I am finsished

with my session and leave the computer it powers off while away.  I did recently install a new video card before I updated and I bought drive boost which reports back to me that my AMD Radon drivers need updated...is this where the problem is?  If so I am

having trouble figuring out how to install my drives properly.  If I unistall the current drive all my graphics change and I lose connection w/ my monitor and it goes into sleep mode...please help.  Thank You.

 

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