HP P6653w Windows 7 64-bit system doing the same
I have a HP P6653w tower with Windows 7 64-Bit OS install on hard drive and an AMD Athlon II X2 250 Processor on the MB. My computer does the same thing and I even sent to computer back to the service center to be checked out and I could not tell the difference when I got the computer back. I did have problems with losing power and the computer turned off, where it would not boot up and I had to use the "ESC" key when booting up to choose the drive to boot from. I am beyond that problem, but the same problem with the computer shutting down when it is not being used. I have checked it for trash blocking vents inside the computer and sure HP service people did the same thing when they had the computer.
I checked the Screen saver, which I changed the time before going into sleep mode, but without much luck. I am going to check a friend's computer tomorrow to see if her computer is in need of cleaning since she is having a similar problem with her Gateway tower. I was thinking that it could be the location where this computer is hooked up since a tower I built had the same problem. The room is cool and the vents are clear so air can flow into the unit and out freely. If the problem continues I may install another fan in the unit to see if that helps it.
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