Disk Utility can't find my drives

Decided to upgrade my old G4 500 from 10.1 to 10.3.9 however, half way through the install the systems hanged. I force shut down the computer (pressed the button at the front for a bit) and tried again... problem is that no drives are detectable. Tried Disk utility and Tech Tool but they see nothing. Video, sound, motherboard etc all working. Disk seems to spin, but it has completely disappeared. I popped a slave drive in to see if that would read... but alas no Any ideas?

Hi Tom. Nearly! I pulled the slave to pull the system back to it's stable build and then reset the PMU.... it took a while to get up and going again but the drive appeared
I then erased/formatted the disk and tried to install OS X 10.1 but with no luck "An error has occurred with the install" "Please try again". I'm thinking the battery may need replacing perhaps. Anyway, will try that and let you know (could be a while before I can get down to get a new battery).
Cheers, Matt

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