Pump It Up PCB issues

pat9000

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I have a Pump It Up machine with the MK3 boardset (celeron-based, CD-ROM & hardware Key) and I have 3 software versions: Perfect, Premiere 2 & Extra. I tried the PCB with extra & perfect software installed and just got a white crosshatch pattern, occasionally saying "LOCK ERRROR!!" in the middle of the screen. Premiere 2 booted up and worked without issues every time.. until today where it too also only comes up with the "LOCK ERROR" screen.

Are the hardware keys (just a single IC--GAL or PAL I assume) themselves prone to failure? what is going on here? Anybody run into this problem? All the obvious stuff checks out, PS voltages, reseating everything, etc.
 
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