G4 MDD 1.25 does not sleep but turns off instead.

I have a G4 1.25 MDD single running 10.3.9 with 80GB and 20GB HD, 1.5GB RAM which is mated to a 20" Apple cinema monitor.
Both hard drives have been erased and verified using the disk utility from the software install CD and the OSX installed cleanly. I have run the Apple hardware test and all the results are okay.
However, if i try to sleep the computer from the pulldown menu, the computer performs the motions as if it's going to sleep but turns off instead. If i try to sleep it with the power button on the monitor nothing happens. Other than this, the computer is in perfect working order.
Does anyone know what the problem can be??
Many thanks
T

Hi-
Steps to take are replacing the PRAM battery with a new one, followed by a PMU reset:
Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3

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