I've got an Apple OEM dual 1Ghz processor card for a Quicksilver G4 that does not work at all. Looking very closely at the card, I see no signs of damage--no scratches, burns, etc.--except at the spots where the heatsink clips attach to the card (see photo). Copper foil is exposed, and on the worst one, it looks like corrosion has worn all the way through to the fiberglass, possibly breaking the line. There's obvious moisture damage with rust and blue copper corrosion. I assume the line that is broken--which runs all the way around the card--is a ground line (?). Could this possibly be the cause of the card malfunction? If so, how would I repair it? thanks!