Had a scare with my Black Knight this week. On Sunday we had a bunch of neighbors over and there were like 12 kids in the basement playing away on the games. That's fine, that's why they're there. I come down at the end of the night and BK is stuck in some loop with the sound just going on and on. I tried turning it off and on and all I got was attract mode but couldn't start a game. Oh crap! I tried the switches on the coin door, it was kind of dark though so I couldn't see what I was pushing. I ended up wiping out the high score (Doh!) and getting into audit mode. Got out of audit mode and apparently reset everything back to default somehow (wondering if batteries were dying). Played a game and thought nothing of it until yesterday. Same deal, attract mode wouldn't start a game. I cracked out the manual and started researching on the internet. The error code on the CPU showed 9 which was either a memory error (batteries?) or an IC19 ROM error. The internet didn't really agree with the assessment based on the attract mode coming up. I replaced the batteries, no change. I replaced some burnt fuses on the sound board, no change. I was ready to give up when I noticed what some of the other fuses were labeled. One of them was for solenoids and I started thinking about the fact that when you start a game, the machine clicks around getting the drop targets in place. The fuse looked good from where I was standing though but, just in case, I popped it out and took a look. It had burnt out only in one little area instead of shrinking back on both sides. I replaced it and the machine fired right up! Best feeling in the world to figure something like this out. Now I need to reset the high score with some monster games.