My WOZ isn't booting. The fan on the motherboard is spinning, and that's about it. I'm getting 'No Signal' on the monitor. I've checked the connectors and the fuses. I've tried jumping pins 6&8 on JFP1 and nothing happened.
When I plug my USB dongle into the back of the motherboard for my keyboard, the little blue light on it doesn't go on, which would seem to suggest it's not getting any power. Same if I plug it into the USB port near the coin door. So maybe power not getting somewhere?
If anyone could help with what to do next that would be great!
PS this happened a couple of months ago, and I replaced the coin battery, and was then able to get the screen as above up and rebooted via my keyboard. It's not the battery now, as it's showing 5V (CR3032).

Thanks, I did that (unplugged the black and yellow wires from the back of the monitor) and no change, still does not boot.

I wonder if their apparent lack of power to the UBS ports is a clue??

I’m getting help on this from a very kind pinsider (thanks Bud!) but just wondering if this is normal?
There’s a flashing red light on the I/O board at D201 (says CPU next to it). See pic.

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I got onto Frank and he was very helpful. We zeroed it down to the motherboard, then Wayne my distributor discovered the RAM had failed. Put a new one in and my game’s working again.

This just happened again (not booting, no playfield lights, fan is spinning).
I removed the RAM and seated it in the adjacent slot. This fixed the issue (had to reboot via F1 and a keyboard).
Hopefully this helps if anyone has the same issue - reseat the RAM.