DVD--not recognized AND stuck in drive

I've had trouble with my G4 not recognizing DVDs. I just put one in that was burned at a store with a friend's videotape--it never showed up in the finder. When I launch Disk Utility, it hangs. I am using an older keyboard without the disk eject button; I can't get the disk to eject, can't drag it to the trash because it doesn't show up. When I reboot with the mouse button held down, the Mac won't start up--I just get a Windows-like gray screen of death.
I don't know what the drive is--it's an old Super Drive--because the Apple System Profiler also hangs when I click on the "Disc Burning" option.
How do I get the DVD out, and how do I get the G4 to recognize DVDs?
Thanks for any help--Bob

Hi-
Try and open the tower drive cover, and look for a small hole about the size of a paper clip, in the front of the dvd drive. Insert a straightened paper clip in the hole, and you should be able to open the tray.
You should then try your Tiger install disc. (While you're at it, boot from the install disk, and run Disk Utility to repair your hard drive).
If the install disk is read, then the drive is probably okay.
You may consider an "Archive and Install" reinstall of your OS X.
Prior to that, you may consider a reinstall of the OS 10.4.8 combo update:
http://www.apple.com/support/downloads/macosx1048comboupdateppc.html
Please post back with progress (or not).

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