How to know if my PPC is dead????

[nasty]

Have you tried doing a soft reset a few times (Ctrl-Amiga-Amiga) to see if it boots after that? I also had a ppc which needed a soft reset to get going.

Thats a good idea, when I start my Amiga for the first time each day, I get nothing but a black screen on my GFX monitor and an error message on amiga monitor (multi-changer error) and as soon as I do a soft reset it works fine all day long!