Printer and Photocopier Troubleshooting and Repair Collection : HP LaserJet II just dies and no sign of ..  
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HP LaserJet II just dies and no sign of power after a short while

(From: Larry Sabo (sabo@storm.ca).)
"I have an HP LaserJet II that will just die after a short time. There are no power lights, not even an error message. If I leave it for a short time it will come back on after a power cycle. It is totally random."

Check the daughter board in the PSU at fault. On mine it had deteriorated solder connections on BOTH ends of the connecting pins. Remove it, resolder the pins on the daughter board, then remount it. It's worked like a charm ever since.