XP limits DOS functions so that COM ports are not usable. Use a DOS boot disc or an older computer.
Good Luck, Eric
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That's not really that bad of a supply. I've fixed quite a few over the years, and yes, the bridge rectifier can short out. It is much more likely that the pass transistor(s) is shorted. You can check them by removing them and "ohmming" them out. Caution: if you have had the thing plugged in, the la...