Problems with DVD tray and installation of OS

Hi,
I need to install Mac Os X Tiger on my Power Mac G4, but when I switch on my G4, it opens automatically the DVD tray and then the system can't boot from DVD and I can't install Tiger.
I haven't got any firewire Hd to try to install the OS from it and everytime I try to use the remote installation, my MacBook can't find the Tiger installation DVD.
How can I resolve it?
Thanks for the support

But I don't understand why everytime I switch it on, the G4 opens the DVD tray automatically...
That effect is often caused by an attached USB device. Usually the cause is a printer, but dongles, tablets, and iMate adapters have also been reported as the culprits.
You can check for that by disconnecting all USB items except keyboard and mouse, then testing. If the problem has disappeared, then one of the other USB devices is the source. Add them back in one or two at a time and test; when the problem reappears, you've just added the culprit back in.

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    12. AIX: Problem with post/wait kernel enhancement
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    </i>
    Regards
    Arunkumar

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