Apple DVD player not working on Mid 2011 iMac running 10.7.2

I have a 21.5-inch, Mid 2011 iMac which came with Lion preinstalled. When I insert a DVD, Apple's DVD player comes up with the following error:
"A valid video device could not be found for playback. [-70017]"
The DVD player works. I can play DVDs using VLC, and I can use it to burn in iDVD, but Apple's own DVD player simply will not recognize it. I hoped this problem might be solved when I upgraded to 10.7.2, but alas it has not.
Does anyone know how to fix or work around this issue? This computer is used daily for my media-heavy job, so leaving it somewhere for service is not really feasible unless I'm completely unable to work on it.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is localized to your user account, or is system-wide. Enable guest logins and log in as Guest. For instructions, launch the System Preferences application, select “Help” from the menu bar, and enter “Set up a guest account” (without the quotes) in the search box.
While logged in as Guest, you won’t have access to any of your personal files or settings. Any application you run will behave as if you were running it for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
As Guest, launch the player and test. Same problem(s)?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
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This question was solved.
View Solution.

Hi,
First, try the automated fixit from Microsoft on the link below.
Windows 7
Vista
Check if the drive is now working.
If it still doesn't work, click the Start Menu, open All Programs, open Accessories, right click the Command Prompt and select 'Run as Administrator'. In to the prompt type the following command and hit enter.
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Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

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Happy Holidays!

Apple DVD player not working on Mid 2011 iMac running 10.7.2

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