My Intel IMac CD Drive is melting CDs.. help?

I noticed a CD-R I ripped to my Itunes library was skipping.  On closer inspection there is mild discoloration on the front and what look like stress cracks on the bottom side of the CD.  I tried ripping a second CD and see a similar result.  My IMac is often hot to touch but it doesn't even feel particularly warm.  It's about 8 inches from the wall with otherwise reasonable venting.  Before I noticed the issue it ruined a rare Japan issue concert CD which really takes me back to the days when I was scared to play a good VHS tape for fear that the VCR would "eat" it.  Anyone else having this issue?

Get Temperature Monitor.
http://www.bresink.com/osx/TemperatureMonitor.html
Or iStat Pro (which will also display fan speeds.)
http://www.islayer.com/apps/istatpro/
Both free.

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