Re: power supply problem. Is the edge connector of the motherboard corroded
and/or burned? That might be a cause.
Re: Strange images. This could be in the monitor's deflection board, or it
may be coming from the motherboard. You can isolate it by connecting an X/Y
oscilloscope to the motherboard's video outputs. If the picture on it looks
okay, then it's a monitor problem. If it's a motherboard problem, it could
be either a bad DAC or bad op-amp.
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