I Book G3 Won't Boot

Hi
I recently took a broken I Book G3 of a friends hands. Originaly I could access Darwin but after that it woul just shut down. I left the laptop booted in Darwin and (This may sound unbelievable) when i came back into the room the cat was standing on the keyboard. Now i can only boot into open firmware. The hardrive has been but in an enclousure and when connected to a G3 desktop it comes up with a volume error message. The hardrive when put back in the IBook now won't spin up. The DVD drive in the laptop is also shot.
Now the I BOOK only boots to a grey screen and i can only access open firmware. I have also swapped out the logic board with one i got on ebay (Yes could be dodgy) and still doesn't Work.
Please Advise
Regards JSW

Have you tried connecting the hard drive to the G3 desktop and reformatting it? If the drive reformats OK, you could install an OS to it using the G3 desktop.

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