Computer shuts off intermittently

Computer shuts off intermittently.
Examples:
1. you can be playing games pre-installed from factory or
2. you can be online doing research, etc.
When the pc first started shutting off, you used to be able to press the button on top of the tower and it come back on, but with it still doing it after months of shutting off; you now have to shut off the surge protector and turn it back on, before you can press the button on the pc tower - to turn back on.
Is this a power supply going bad? or something else.
Thank you for any information found and given.

Temporarily remove the surge protector from the system, then try your system.  With that done, use this PSU diagnosis.
I am a volunteer. I am not an HP employee.
To say THANK YOU, press the "thumbs up symbol" to render a KUDO. Please click Accept as Solution, if your problem is solved. You can render both Solution and KUDO.
The Law of Effect states that positive reinforcement increases the probability of a behavior being repeated. (B.F.Skinner). You toss me KUDO and/or Solution, and I perform better.
(2) HP DV7t i7 3160QM 2.3Ghz 8GB
HP m9200t E8400,Win7 Pro 32 bit. 4GB RAM, ASUS 550Ti 2GB, Rosewill 630W. 1T HD SATA 3Gb/s
Custom Asus P8P67, I7-2600k, 16GB RAM, WIN7 Pro 64bit, EVGA GTX660 2GB, 750W OCZ, 1T HD SATA 6Gb/s
Custom Asus P8Z77, I7-3770k, 16GB RAM, WIN7 Pro 64bit, EVGA GTX670 2GB, 750W OCZ, 1T HD SATA 6Gb/s
Both Customs use Rosewill Blackhawk case.
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