G4 ejects DVD drive on bootup

Hi,
Since aquiring my own Mac G4 digital audio for dirt cheap (£0 ) I've been reassembling the peices. It works entirely, but I have a strange problem with the optical drives. Since the guy I had got it from removed almost everything (RAM, CD/DVD, HDD), I used spare parts to get it running. It boots into OSX 10.5 fine and everything seems to work ok, but upon powering the mac up, it ejects the DVD drive tray when the gray screen shows. It's done it with every drive I have tried and stops me from booting from CDs.
Is there any reason it could be doing this? These drives I know work 100%.
Thanks
Naoki

Now that the machine is assembled, reset the NVRAM:
Boot to Open Firmware (Cmd+Opt+O+F)
At the Open Firmware prompt, type:reset-nvram
Press Return.
At the Open Firmware prompt, type:reset-all
Press Return.
The machine should then restart, settings returned to default and a new device tree created.

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