I have a 600XL that's been in pieces for a while as I was using it's chips for the 600XLM board.  When I bought this machine, it was without any cables and I thought it was DOA as it came up with a black screen.  While I did some troubleshooting on it, I didn't spend much time on it.  Last week, I was reading some troubleshooting instructions and decided to try it again.  After some messing around with it I found out the only problem was the RF channel switch was bad and I was able to get up a p