Comment Re:A viler den of filth than you have ever seen (Score 1) 7
You won't find scorch marks on the contacts. If you rub them with plain white printer paper, you will see the layer of greenish oxidation that builds up over time. Taking them out and reinserting them probably cleaned them off a bit, but if the machine starts acting up again, clean the contacts with the paper by folding it over both sides, squeezing, and sliding the card back and forth. It's just abrasive enough to clean them pretty good without leaving metal filings all over the place.