WAYYYYY back in 1981 we had a "Macsym II" data aquistion computer, ran a custom superset of basic. It was the most cantankerous thing I have ever seen, usually I knew where to kick it to get it into the boot sequence. One day that didn't work, and the lead E&I guy told me clean the boards.To keep the 5hread on topic.
Sea story time
After graduating from kl-10 school I was scheduled to do the maintenance on Sunday night at midnight on the 7 mainframes they used. That involved checking fans and voltages. An experienced engineer was also there in the event there were problems
While checking the 24v supplies I shorted the 24v to the 5v buss. I went to fetch the experienced guy who was sitting in the lunchroom. I told him I screwed and he replied;
"You broke it. You fix it."
I ended up having to replace 7 boards I had blown out. But I did finish before 8AM so all was well.
Which reminds of an off color joke that poked fun at IBM engineers. The punch line was the field engineer on his wedding night saying;
"Don't worry I will have it up by morning."
Ben
He came back from lunch and asked how it went? I told him I steam cleaned them all, put it together and and it went POP and smoke came out . His look was PRICELESS. I didn't do that, cleaned the board contacts with cleaner and it started right up