I have just received FOUR breadbin Commodore 64s.  One is missing the
mainboard, one turns on, but with a black screen, and two don't turn on
at all (power LED does not light up).

When our lockdown ends, I'm going to get a multimeter, but I'm wondering
if there is a common and obvious cause for this that I could look at
before I get a multimeter (which may not be for weeks because our state
premier likes to imprison us).

I've looked at the fuses, one was broken, but putting the good fuse in
both machines didn't work.


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