DVD Burner won't recognize discs

I recently installed an lg gsa-4166b dual layer dvd burner to my emac and for some reason it won't recognize cds or dvds. Whenever I try to burn anything and put in a blank disc I get the message "no disk inserted". I'm running Mac OSX 10.4.11 and even installed the PatchBurn utility, but still no luck. Can someone help me?

Oh really? Now that is interesting, because in fact I also have a Western Digital MyBook Pro external HD. Actually 2. They worked fine until the last month or so, and one of them had a bad disc so I had to have it replaced on warranty. Now the other one is acting strange -- won't mount. WD had me upgrade the firmware and reinstall the latest drivers. But it's still not acting right.
And you are also correct about the disc playing. Normal DVD's, CD's and CD-ROMs play fine. It's just blank CD-R's etc that come up as "unreadable."
I bought these two WD MyBook Pro 1 TB drives on 10/20/2007 however, and I don't recall that I had a disc burning problem that long ago. Maybe it's been that long since I burned a disc? I'm not sure...
Incidentally I've had another problem for a really long time, which is a very long Mac OS startup. I am not sure when it started but it might have been about the time I bought these drives and installed the software. See threads:
http://discussions.apple.com/thread.jspa?threadID=1765645&tstart=0
and
http://discussions.apple.com/thread.jspa?threadID=1880557&tstart=0
Yesterday two things happened. One, Apple sent through another automatic update requiring a reboot, but I didn't catch what it was. Two, WD had me upgrade the drive firmware and software drivers. Suddenly my bootup problem has gone away. So the question is, was it Apple's update or WD's firmware upgrade?
And lo and behold, I just entered one of the same blank Fujifilm CD-R discs and it mounts without a problem. I can now burn discs again. I have a feeling the WD firmware upgrade fixed a lot.
Yeesh! I think I shall be buying drives from someone else in the future.
Thanks for this very insightful tip.

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http://support.apple.com/kb/HT2801
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DVD Burner won't recognize discs

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