Optical drive is not reading any disks

Hello,
whenever I insert a disk (cd or dvd) it does not show up in the finder or anywhere else.
Instead: Toast 7 starts and states that it is an empty dvd.
But Toast does recognize the size of the disk (4.5 GB or 7.2 GB for example).
To get rid of that optical disk I have to open terminal and type in "drutil tray eject". Nothing else worked.
The strange thing is, that this problem occured about a week ago and for some strange reason, it dissappeared yesterday. I was able to read several dvds and cds on Friday. Now the optical drive seems to be completly "ignorant" again.
What can I do?
Is the drive really broken?
Thank you for your advice!

Hello,
my DVD-Burner was replaced by the customer support of the Gravis AG in Cologne.
They also replaced my battery which they identified as defect (Actually, I didn't). The Macbook was less than two months old.
Nevertheless, I am happy to have it back and I would like to thank you for your hints and tips.
diverse   Mac OS X (10.4.9)  
diverse   Mac OS X (10.4.9)  

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