Thanks for responses. Model is A1095. I've been trying to boot form HD and then from install disk (1 of 2). Same symptoms persist even after PRAM reset. Fan and disk sound like they're getting up to speed, then chime begins and cuts out. Screen remains blank throughout.

One cncern is that I haven't applied thermal past correctly and that I used it where there was the remains of a thermal pad. One clue to this is that after my various attempts to reboot the underside of the Mac at the keyboard - around the processor - are very hot. I've never used a G4 PowerBook before, but this seemed excessive.

Cheers

GSJ

[quote|gsj4gsj]Thanks for responses. Model is A1095. I've been trying to boot form HD and then from install disk (1 of 2). Same symptoms persist even after PRAM reset. Fan and disk sound like they're getting up to speed, then chime begins and cuts out. Screen remains blank throughout. One cncern is that I haven't applied thermal past correctly and that I used it where there was the remains of a thermal pad. One clue to this is that after my various attempts to reboot the underside of the Mac at the keyboard - around the processor - are very hot. I've never used a G4 PowerBook before, but this seemed excessive. Cheers GSJ[/quote]