I had a Compact Mac (can't quite remember which one) back when i lived in our old house before it got condemned. Anyways, one day it wouldnt "POST" or chime. Just a bunch of scrambled graphics on the screen. I took the mobo out and washed it with hot soapy water and a toothbrush. then i used a pink hair dryer to dry it off, making sure to not overheat the components. after i was sure it was dry (check under socketed chips for water) I plugged it in and it worked great. this was back in 2011 or so. I don't still have that compact mac, I had to sell everything when the house was condemned. but I know who has it and it still works to this day. He uses it with X10 software to control his lights in his home when hes away.