I decided, first to check the PSU voltages.
Here are the figures :
-10,2v instead of -12v
5,1v instead of 5v
11,3v instead of 12v
5v is the important one, the others being mostly optional
Do you get any video output? Black screen?
I suspect it may be capacitor issue which is holding reset low (high?). If it's not already been re-capped then it's long overdue (same for your other A600s).
Steve
