I just picked up a Williams millionaire and when I brought it home and connected the head and cabinet when I fire them game up there is an extremely loud humming coming from the cabinet. The humming goes for about 10 seconds, becomes intermittent and then starts up again. I turned the machine off after like 15 seconds.

The display reads fine, no switch errors. I didn't want to fire up a game because I don't know if this a sound issue or a power issue. This is my first system 11 game.

Any help with this would be greatly appreciated.
Thanks
Lou

It's definitely not a sound issue, because the lights and everything flash when the game goes intermittent.

I double checked the ground wire that screws into the backbox and retightened it and nothing changed. going to try to track down the where that ground wire goes and look at that end.

thanks

I had a connector mixed up in the cabinet. They were the same size same number of pins. Just had them crossed. Everything is a okay! Thanks

There are a few 4 pin connectors that aren't keyed that could go to the MPU and the sound board like dothedoo stated. I didn't break the machine down so I wasn't sure where these pieces went, not to mention there is an extra femal 4 pin connector that is supposed to go to a external rotating flasher beacon that they put on exported games...