Leopard installation disk ejects before installation begins

When I attempted to install Leopard after the initial screen and the reboot, my iMac chugged a bit then ejected the install disk. After several attempts which resulted in the same thing, I called Apple and, during the hour I was on hold, kept trying. At the end the install started and so I hung up. However, I am not sure the installation was quite Ok since there appear to be some anomalies. For instance, the little close, minimize and expand "LEDs" at the top left are all grey, no color although, on my PowerBook, where the installation went fine, they are the usual red yellow and green. ALso, when I rebooted the iMac after the install, my wall paper was gone although, again, when I did the same on the PowerBook, it was back again. I decided to try to reinstall on the iMac but again encountered the same problem, the disk ejected before the install started. Any ideas?

Premature disk ejection can be caused by bad RAM or a "greasy" disk.
Take a careful look at the disk for a shiny film. If it's there, use a damp soft cloth and wipe from the center to the outside, radially. DO NOT ever wipe a DVD in a circular manner.
If the DVD is OK, then it might be your RAM or some other hardware problem.
Many have had marginal DVD readers and had success using an external DVD drive.
If you have another Mac, see how the disk behaves in it.

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