Need some help understanding how to diagnose this machine I recently picked up. The machine was working, but was doing some erratic things. Sound wouldn't work, booting issues, but when it would work darthead worked great. After doing some diagnosis, I found that my original Linear power supply was faulty and not putting out the correct voltages. I replaced it with a switcher ( amazon Arcity). I have verified correct voltages on 5 v and 12v. Had to fine tune it a little with adjustment screw. Its working great now. Powers up comes on, go through initialization, and ready to play. Sound is now working like it should. Wierd thing is that now my darthead will not read anything. I did check connections and cleaned. I can see that the darthead and small control board attached to the back of it was replaced recently. I went ahead and dissasembled to look further. Looks like new. The red light comes on the small board on darthead. I also checked and cleaned all connections at main control board, and checked voltages. It has also been replaced recently and looks great. Can someone help me figure this out. I have read manual and looked at a few diagrams, but I am not sure how to diagnose this. I have also combed these forums and found some info, but not what I need. I cannot see the darthead being bad as it worked great before. Any help would be appreciated! Thanks