Intel iMac SuperDrive (Matshita DVD-R UJ-846) DVD Burning Problems

Hi there:
Having a strange problem burning DVD's now. I have a January '06 intel iMac Core Duo 2ghz, 2GB RAM. My DVD burner suddenly no longer will burn DVD's. When I put in a blank DVD-R, it just spins for a bit then spits it out, no prompt or error message. When I put in a blank DVD+R or DVD-RW, it gives me the usual prompt that a blank DVD has been inserted and asks how to handle it. But when I try to burn, it opens the session, then quickly finishes the session (without any burning) and spits the disc out with an error that burning failed because of an inability to calibrate laser power level for the media. Sometimes it says due to a media error. It also will not read a previously burned DVD data disc, including the OS install DVD that came with the computer. It will however, read and play movie DVD's, and also reads and burns CD-R's with no issues.
I've tried the following fixes with the following results:
1) Change media. Have tried several different types and different brands. No success.
2) Burn DVD's from an external firewire DVD burner. Works fine.
3) Hardware Test via the install DVD (on the external firewire burner). No problems found.
4) Did a fresh install of the Tiger OS onto an external firewire hard drive, booted from that, and tried to burn. No success.
5) Tried burning from Disk Utility and Finder. No success.
6) Put a cleaning CD into the drive and let it run. Still no success after.
System profiler says the drive is ready to burn CDs and DVDs. CDs work, DVDs don't.
Any ideas as to what could be causing this and how to fix?
Thanks!
--Equus

If you guys did a search on the optical drives you'll discover that they have a rather extensive
history for failure. the failing optical drive process starts off rather slowly and worsens over time.
You could replace the internal optical drive but rather than performing surgery on your Imac
you would be better off going with an external optical drive.
If your IMac is still under warranty you can have it replace but I would still pick up an external
as well, I have read a couple of threads where even after having the internal replace the same issue
happened yet again.
I ordered a LaCie that does rather well.
http://www.amazon.com/gp/product/B001P5C9S0/ref=oss_product
I did however discover a couple of minor issues with my LaCie...
1) When the mounts a disc , for some reason the mechanical ejection button
on the face of the enclosure is disabled. This is not a major issue right click and eject or, drag the
icon into the trash
2) if you are wanting to lightscribe be sure to go to the LaCie website and download the latest
lightscribe app, the one that came with mine was out of date and did not work in Mac OSX 10.6
3) My lightscribed DVD's had a problem , the images where filled with rings from the center of the
disc out, I have discovered this is due to calibration , Amazon has shipped me a new Lacie that
I have sitting in a box next to me, I have not had a chance to test out the new unit yet.
You may also look at OWC's optical drives
http://eshop.macsales.com/shop/firewire/optical-drives/
Either way make sure that you go with an optical drive with Firewire.
James

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