"Ray Field" wrote in message
news:jRZ7f.56842$S4.23287@edtnps84...
One of the first lessons that we learned (practically) about computers in
aviation was that most problems are contact related.
First line of action was shut down and reseat the applicable connections,
whether it be cables or cards. Solved 90% of the problems.
Ray

No cables except for the keyboard. I did take an eraser to the contacts.