Help... my disks are not being recognized

i wonder if anybody could help me...
we have had our macbook pro for well over a year now, all of a sudden yesterday the laptop stopped recognizing any CD's or any disks of any kind.
This is starting to become a problem, i would greatly appreciate any ideas as to why the computer is doing this or anything i could possibly do to fix it.
Thankyou

1. Try resetting your SMC.
Resetting the System Management Controller >>
2. Your laser pickup could be dirty. You can buy a cleaner disc for that.
3. It may be the media you're using, but it nothing is recognized, it may be hardware related.
4. Run your hardware tester.
5. Is your optical drive being recognized in your System Profiler?
-Bmer
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