Are you sure it is the PSU? HAve you tried to clean it out with a can of compressed air?
Also just a note for your sig remark. Read the rules.
7) Signatures must adhere to the following specifications:
Text signatures may not exceed 15 lines in size 1, or 8 lines in size 2. Text size 3 and above is not allowed. Text size 1 may only be used with a graphic, with no more than 8 lines.
The combined size of all images in a sig is a maximum of 468x120. Please keep the file sizes small for loading times.
Any scripts that display a user's IP address and browser information are not allowed.
Signatures are subject to Rule 3.
Are there any benefits for running Folding@Home?
Aside from the satisfaction of having played a small part in research that may well cure a multitude of diseases, there are a few perks. For your dedication you can have your name added to our milestone list. You also get a break on your signature restrictions with F@H team members being allowed to break the image restriction by having a F@H stats signature and a milestone userbar.
So yes some users like myself have larger signatures but not by 6 Million. It is cause WE do something to give back to the site and the world at large.