Just to keep you up to date ... after some time and attempts at booting with a new drive and recently installed PSU my PPC iMac G5 seems not to like OS 10.5 and so I returned to 10.4.11 and all is fine ..... Interesting ... I have no idea why it refused to accept the latest OS. Any thoughts?
Thanks for the suggestions Delta
I only recently had the PSU issue resolved with a new unit via Apple and the hard drive is brand new ...In fact it has only been shuting down since I have installed the new drive.
The "swelling/leaking capacitors" thing is something to look at though.
Cheers