Hmm, did you turn the tv/monitors on ?
:lol:
I can't remember how many chips were socketed on the A1200 mobo, but I don't think there's many, you may be better trying an A520 modulator from an A500 if you have one hanging around and see what happens with that. After that its repair shop time by the sound of it :-(
Did it suddenly stop working ? Did you do something that may have caused the failure ?? Good luck