Powerbook G4 Woes...maybe getting SR mbp after all

My powerbook started locking up running programs last night and this afternoon froze completely. I turned it off and turned it back on a little after. It stayed at the screen and failed to boot past this. The hard drive was being accessed for about 20 minutes until everything stopped altogether.

I rebooted again to find it stall on the first grey screen. I cannot eject the disc inside to try to format the drive and basically can't do anything.

I'm new to macs so I'm not sure if there is something I can do here.

Luckily I set aside money for a MBP..

UPDATE:

I got the disc out and it still wouldn't boot so I popped in the installation disc and that locked up.

UPDATE 2:

Opened Startup Disk utility in installation disk to find my primary hard drive was not a boot option.
I then started to run the installed and it stopped at the second screen again.

UPDATE 3:

Opened disk utility and locked up at Gathering Disk Information.

Nothing is working...Cannot erase the disk or partition it etc.