Locate the region of panel affected. In this case left of screen from front so locate the board on the back of the panel. There are two C boards on 42" 1080p PDP. Your fault is on C2, the righthand board (looking from rear of set.)
With power off (unplug set) disconnect last C board connector. Plug it in again. Check if picture comes back. If not replace C2. If pic does come back you may need to resecure connector and consider contact cleaner on it.
NOTE: Never disconnect/reconnect these connectors with power on, otherwise you could fry the plasma panel permanently!
You did the ones on the left of the panel? That is a common problem. They're a bugger to get aligned but you haven't broken anything, just unplug them and line them up perfectly. When you plug the connector in, you'll feel a little "click" when you plug it in if you got it right. Of course, power must be off while doing this.
Your connectors of interest run along the bottom of the panel, not the side.
i unplugged and plugged the bottommost right panel ribbon cable and its still black. I unplugged it again and powered on the TV to make sure I had the right cable. It was all white and crazy looking. I plugged it back in, still pitch black. Now I just need a new c2 panel I guess. Thanks so much tom.
Any idea how to remove this panel? it seems like its behind a million things including the support to the stand!