Have you been adding drives or cards over the past year?
If so you may have exceeded the power supplied by the PSU.
AMDs are famous for needing a lot of power and going wonky when you add one or two extra cards or upgrade your video card.
Try unplug some of the cards and drives you don't need.
Get a decent fan for the CPU. (Zalman, Gigabyte et al)
Check you bios to see if the fan is set to variable - ie: changing speed to meet higher temps.
And set it to a static speed and learn to put up with the extra decibels.
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