< Help? I have 2 power supplies for DEC BA123 boxes which < no longer function. I suspect that in each case, something very < simple has gone, such as the primary capacitors on the AC/DC Don't ditch the failed supplies. They can be hard and expensive to find. First failure mode on them is overheat due to failed fan. Usually that takes the internal fuse. Open with care as the caps in them can hold a lethal charge. Rare is the failure of the caps from what I've seen. The high voltage chopper transistor or the input rectifiers are more likely to be suspect. Allison