Power to monitor board

[oldmumak]

I'm not getting any video when I turn on my arcade. The black and white wires in the pics are coming from a fuse and the isolation transformer, and are going into the monitor board. On the connector shouldn't the black wires match up?

[MonMotha]

Heh, yup.  They should.

The pinouts for those connectors aren't fully standard.  The "normal" pinout when using a 3 position connector like that has earth ground in the middle, but apparently somebody decided to be different when wiring up either your monitor or cabinet.  Moving them to match up should fix your problem.