DVD on new iMac won't play

I'm trying to play a commercially made DVD on my new iMac with Mt. Lion. The preferences are set to play automatically when a DVD is inserted. The title page shows up, but it won't play. When I click the play button, the 'stop' button flashes momentarily, then shows the 'play' button again. I've tried to play it using menu commands, the space bar and hitting the play button. Each time the play triangle symbol flashes to the parallel lines, but goes right back to the play triangle. This is a new imac. I've not tried to play a DVD on it before. ANyone have any ideas?

Since you list your operating system as 10.7.4, I would guess that this is NOT a "New" iMac. 10.8 has been the installed OS on new systems for quite some time. Also the new iMacs releaased last month do not contain an optical disc device. If you need a DVD player (or recorder) you will have to buy an external SuperDrive (or other similar device).
Next thing when trying to play a DVD for the first time, there is normally a DVD Region selection window that opens. There are several regions in the world and the US and some other countries use region 1. You need to have admin privlieges to make the change. ALSO REMEMBER that there are only a total of five changes you can make to the region setting. Once you make the fifth change, and that number includes the first region you select, you are stuck with remaining on the fifth change you made.
Now if the region had been changed by someone previously and you are already on the fifth change and the region selected for the fifth change does not match your DVD;s region, well you are out of luck.
You may want to check on the region setting info here: http://support.apple.com/kb/HT2397
Note that the region code setting is hardware based and will not be changed by even a complete erase of the hard drive and reinstalling an OS.
Another thing to keep in mind is that recent updates to the OS will sometimes give "funny" results when you are using an external monitor (or projector). Copyright/Digital RightManagment will sometimes prevent display with anything plugged in to the Thunderbolt or MiniDisplay Port.

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Repost: brand new mac won't play/recognise/mount audio-cd's

No idea what's going on here. I posted a question which I will paste below. Someone posted some suggestions for me (Dave Sawyer if I remember the name correctly, thanks again!) which lead me to ask wheter I was or was not supposed to have a file named cd info.cidb in a certain folder.
Now all of a sudden my thread is gone and I find the following mail in my inbox:
NoName posted "Re: brand new mac won't play/recognise/mount audio-cd's" in "brand new mac won't play/recognise/mount audio-cd's" on Aug 1, 2008 4:21:01 PM.
You wouldn't have that file unless you used iTunes to get CD metadata from Gracenote. I hate Gracenote, therefore I have never had that file on my system
To view or respond to this message, visit <http://discussions.apple.com/thread.jspa?messageID=7775827#7775827>
To view the full topic, visit: <http://discussions.apple.com/thread.jspa?threadID=1643589>
To view the forum, visit: <http://discussions.apple.com/forum.jspa?forumID=782>
We appreciate your participation in Apple Discussions. Thank you for being part of our community.
Apple Discussions Team
The origial question post was the following:
Hi all!
I am totally new to the macbussines (got one for a month now) and not using cd's much I never tried importing one untill today... and it simply won't. I think it's supposed to show the audio-cd on the desktop and give me an 'import cd' button in itunes whenever I insert an audioCD right?
It won't do... it'll take it in, turn it a few times and slide it right out again.
What I tried so far:
* toying with itunes settings for importing (import cd & eject, show CD, ask to import cd etc)
* toying with the cd&dvd preferences under system preferences
* click the mount 'button' in disk utility as was suggested in all those threads regarding cd's not mounting first time (my cd's won't mount the second or 30th time either)
* resetting the PRAM
Nothing so far.
It does recognise DVD's but no audio cd's whatsoever, originals, burned ones. You name it. As I don't use CD's a lot the newest CD dates from 2003, but that can't be it, can it?
Any suggestions would be highly appreciated...
o/
Am I going para? Where did my post go? It's totally gone, not even under 'my posts' or anywhere...
Still no solution either... suggestions still welcome therefor

My guess is that someone didn't like that I said I didn't like Gracenote.
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~~~~~~~~~~~~~~~~
Hardware Overview:
Model Name:          iMac
Model Identifier:          iMac7,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          2 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          4 MB
Memory:          4 GB
Bus Speed:          800 MHz
Boot ROM Version:          IM71.007A.B03
SMC Version (system):          1.20f4
Message was edited by: VPLNX

Go to: Apple / System Preferences / CDs & DVDs and make sure that "Open iTunes" is selected for When you insert a music CD:

DVD on new iMac won't play

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