McVenco:
Tried all the obvious already? Like stripping the A4000 to its lowest form of life (2 MB Chip, no fast, no harddisks, no keyboards, no mice.... ) and then start it? Tried different Kick-ROMS? PCB around the clock-battery still okay? Oh... and probably even more interesting: How's the jumper-settings on the main-board? I vaguely remember the same behaviour on my A3k when I had been messing around with those settings.