G4 shuts down but have to wait and manually restart

I suddenly have a problem where if I try to restart my G4 (running OSX 10.4 or OS9 - I have a dual boot with two hard drives) it shuts down but does not restart. If I try to start up immediately it just cuts out, and I need to wait about 5 min before I can get it to start up. I've replaced the battery and tried resetting the CHUD switch on the motherboard, but to no avail. Disc checks ok too.
Any suggestions would be appreciated.
G4 (Quicksilver) 733MHz 640Mb SDRAM   Mac OS X (10.4.8)  

disconnect any peripherals, minimize RAM and leave only 1 hard drive connected, see what happens.

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