Hey Beachy,Remove the logic board and stick it in the dishwasher. Run the cycle, with no soap or other dishes, obviously. Let it dry thoroughly, then reassemble.
Seriously. Sounds to me like you have a leaking capacitor. The dishwasher trick is known to provide a temporary fix in some cases. The permanent fix is to replace the faulty capacitor, or to find another logic board.
I used to be NASA Certified with regard to soldering, so I could probably replace these caps without lifting the pads, but I can't really say with any degree of certainy, if they are bad, or just look bad. Part B is finding decent replacements.
Denatured alcohol would clean them up, but perhaps your last suggestion is really the most logical. Pun intended.
This whole episode began as a good will gesture. I was just going to give it to these folks after I removed all of the games from the HD. The grandfather said he didn't want his granddaughter playing games all day. That didn't sit well with me, but I had already committed myself. Then I get the 'chime'. Guess that's what I get for playing 'Centipede', which I thought would be, for the last time. Man, was I right!
Anyway, thanks for the suggestions.