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Computer just shuts off randomly - how to find cause
My home built system (Gigabyte GA-E7AUM motherboard with Intel Quad Core and 4GB ram) started to shut itself off in the middle of playing a movie or listening to music. The computer is only used for media activities (running JRiver Media Center as a client).
I was not having problems before upgrading the CPU from Core 2 Duo E8400 to a Core 2 quad Q9550.
So I assume the problem is this area.
I've been monitoring the CPU temps which are in the 50 - 55 degree C range (not high enough to shut down). I usually leave the computer running 24/7 and sometimes it stays running, even under load, but today it shutoff twice within fifteen minutes.
Watching MB voltages and CPU and MEM loading, but nothing looks wrong. I have a 550W Seasonic S12 power supply, a Crucial M4 SSD drive and one 500GB WD green drive in the case. And the video card is a NVidia GTX 750Ti.
How can I figure out what is causing the shutdown?