Have you run the windows Event Viewer to see if there is any information that might point to a problem?
What brand/model is your power supply? How old is your psu?
When was the last time you did a thorough cleaning of the inside of the computer case, fans, heatsinks, etc.?
Check to see that all of your hardware is fully seated in the slots and that all cables and wires are securely seated.
Check to see if your cpu heatsink is secure and isn't loose.
You can turn down the sub-woofer volume or disconnect the sub-woofer and play music to see if the problem goes away.
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.