Hey there 3000 are you talking about the on/off switch or your power source ?

The cabinet you have there looks like a Scramble cabinet here is a link to KLOV that shows the scramble cab .https://www.arcade-museum.com/game_detail.php?game_id=9447 , the game was made by Konami. Most of its art work was stenciled onto the side. YouTube is a great place to get info on Jamma conversions , I want to build my own Rasberry Pi bartop so I have been looking at those vids a lot lately. You should also join KLOV.com . Killer List Of Video Games  , lots of help forums there and the people I have dealt with there are super friendly and willing to help.

Here is a place  I found when I was researching multicades for myself. https://www.phoenixarcade.com/product-category/multicade-arcade-classics They have a great control panel that is for multicade it has 3 fire buttons spaces and a place for a trackball and of course a joystick, all sold separately of course . It will fit right up to your ms pac machine. They also have cabinet artwork if you choose to change it. If you google multicade kits it comes up with a lot of great sites also. Good luck

Welcome to the madness as John would say !! I would join KLOV  (Killer List Of  Video Games) to they have a lot of nice people that are in the hobby also, You may be able to get the board you have repaired or replaced for a reasonable price , also if you google (arcade game cpu board repair) there are some places that repair them at a reasonable cost. Once particle board gets wet its hard to do anything with you may need to cut away the bad part and replace it with a new piece and then bondo over and paint. Sometimes you can look around and find a empty cabinet to and then use that. I was the same way started out with the intention of one multicade and now 5 games later I'm hooked !!!!! Good luck !!

Hey there 505, is this a new built multicade ? Since you know that the speakers work I would inspect the jamma harness itself trace the speaker wire back to your harness plug and then check the contact tab for a bent, or damaged tab or maybe dirt it may need to be cleaned with a dab of electrical contact cleaner on a q tip. Also check the wire on the harness at the back of the jamma plug there may be a break at the pin that connects the wire for the sound. You may have to replace the jamma harness itself. youtube has some great vids about working on and hooking up jamma harnesses . they also make a two in one connector for jamma board harnesses so you can run two jamma boards at one time . You switch between boards by pushing the one player and two player at the same time, which puts less wear and tear on the jamma connector. Hope this helps.   

You might wanna try KLOV.com (killer list of video games) lots of great info and helpful people there that are into the hobby.

My name is Tim, been playing arcade games since age 6, I stumbled upon Johns videos and realized that it was possible to have a full size arcade game of my own . I wasssssss just gonna get a multicade BUT 4 games later I'm like oh crap I'm hooked !!!! Thanks John !!! I have a working Outrun , 2 multicades , and have just scored an operational Gorf !! Gorf needs a little cabinet tlc, but I am excited to get started on restoring this classic. I'm glad to be part of this forum.

My all time favorite top 5 games.
1. Galaga  2.   3. Double Dragon  4.Dig Dug  5. Ms Pacman

I had a flashing screen on my outrun and it ended up being one of the eproms not seated correctly on the video board.