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Fellow 80-ers, Just got a PS for the 80 as I thought the old one was dead. Its connected to original monitor which works, but when 80 is turned on, screen starts flipping and snow ... and no power light on keyboard. How can I tell if the MB is bad - didn't see any burnt items and all the...

Hi gang, Just added my high school computer to my vintage collection - system and monitor. Monitor powers on, but power supply - no red light on system. Cut open the case - fuse looked ok, but replaced. Nothing looks blown or burnt, so ... how can you test (voltmeter, etc) that this thing is...