Has the coin cell battery been replaced recently?
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Quoted from robm:OK, a bit of an update. My mate has worked out that if he turns the monitor off, the machine boots and plays perfectly (obviously no display). Then if he turns the monitor on, it reboots.
So appears to be like a WPC reset. Does this indicate a power supply issue or a monitor issue?
I have suggested (since i am a deecent drive away) that he try and power the monitor externally (not sure if this is possible).
Does this point to the power supply of the mahcine - are there components that fail, not even sure where/what the power supply looks like in a WOZ - is it just a normal PC power supply?
He has also commented this only has occurred since the code update - that siad, he only had owned the machine for 4 days prior - so it had some use from him, but not extensive. I can't see the code update would cause this sort of issue?
I seriously doubt it's a power supply issue as the monitor is just running off A/C line voltage, it's not powered from the PC. I would suspect a DVI / HDMI driver issue is causing this. I'd try changing the connection i.e. if it's on HDMI try DVI or VGA or vice-versa.
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