With arcades, always go for the MOST common failures first, before assuming you need board work. I mean there's only like 4 or 5 main components in every arcade ever made... Power/Monitor/sound board/SPKR/connectors/pots/ect.. Board failure is actually the least common cause of all the arcade failures.
Most likely power supply died... It's so common that it's like they designed them to fail on purpose!
While some power supplies could cause other things to fail, it's not common for a power supply to randomly fry other things. The exact opposite is actually the case. Dirt, bad fan, over load, bad caps, lightning strikes, power surges from utility company, ect. CAUSE the power supply to fail to not push enough out, typically it's never a case where it's too much (unless it's turning that dial too close to 6-7 volts!).
I WOULD strongly suggest you test the 5V output and calibrate your new power supply to be 5.1VDC BEFORE plugging it in to your main board. You will save yourself an overpriced "diagnosis" and/or $300 "new power install repair bill" from your local "fly by night arcade repair guy".
