You might have a failing power supply.
How old is your psu?
Brand and model names?
Can you borrow a good quality power supply to test with?
We need detailed information about ALL OF THE HARDWARE in your system.
We can best help you after you create a detailed hardware list in the System Specs portion of your
forum profile http://forums.tweaktown.com/profile.php?do=editprofile at the bottom of the
profile page or in your forum signature http://forums.tweaktown.com/profile....=editsignature.
Be sure to include brand names and model numbers.