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#11
Old As Dirt
You said it was "old as dirt".
Have you cleaned it to remove dirt/fluff from the fans, heatsinks and vents?
Have you made sure that all of your components and cables are properly seated in their sockets?
If you are going to play around with your PC's internal components, remember to turn the power off and to take anti-static precautions.
You may need to remove the heatsinks, clean the old heatsink compound off of them and the chips and apply new compound.
Remember to read the handling/usage instructions.