Thank you. I had a talent for swapping out hard drives, so now it is my job to try to fix all of the computers when things go wrong. As you can tell, I don't really know as much as I need to know to do this. This IIci is acting a little odd. I have a different one that is all clean and shiny that may get swapped out, but now I know something now that I didn't know before.
That looks more like sticker residue or dirt to me, because the pins are all still shiny. That's the CPU, so if it's bad, things really won't work.
I would try wiping that off with some rubbing alcohol on a paper towel.