Dvd won't play in iMac

I just burned a DVD of iPhoto slide show using idvd on my iMac but the same dvd isn't recognized by my iMac ("dvd you inserted is not recognized by this computer") and it wouldn't play. Neither does it play ANY DVD from any source.
HELP Please!!!!! Thank you.

The first thing to do is get a DVD cleaning disk and use it; your problem is PROBABLY just dust over the optical system of the drive. Let us know if that makes everything OK.

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IMac 2008 OS10.9.1 external dvd won't play movie DVD's

iMac 2008 OS10.9.1 external dvd won't play movie DVD's. Other DVD/CD's are recognized.
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Any help would be greatly appreciated. This is all red because I am ******!

I have discovered, no thanks to Samsung techs, what the problem is, and it might be revealing for others, as well. It seems that DVD Player, which is the app Apple provides in OS x for (naturally) playing videos, doesn't work with external drives if the computer has an internal drive – even when, as in my case, the internal drive is dead.
I have learned, however, of the existence of a couple of alternative, free applications that run video and audio disks with external optical drives, and one of them, at least (VLC), seems to be widely acclaimed. Does anyone know whether bypassing DVD Player could be a bad idea? There were some gripes from one or two reviewers about awkwardness with playing audio DVDs with iTunes, but I'm not sure what they meant when they said that you have to click on individual items in a selection. Would that mean, for example, having to click on each movement of a Mozart trio? That I couldn't play an entire album's contents of another kind of music without clicking on each song?
Getting the internal optical drive replaced would be prohibitive, even if the parts could be obtained, so I guess I'm stuck trying to deal with the external drive I have and finding the best replacement for DVD Player that I can find. The interesting thing is that the drive works beautifully with a MacBook Air I tried it with, so I guess that is because the Air doesn't have an internal drive?
Wouldn't you think that Samsung techs would know all this? The one I spoke to told me to make sure that my system preference for CDs and DVDs was set to open automatically with DVD Player and sent me all kinds of FAQs, plus a way to get an RMA number for a return. Not a word about difficulties with Macs having an existing internal drive. And all after spending a very long time talking with me about what was going on, what the error message was, and so on. I guess the message hasn't gotten to them.
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Short content DVD won't play

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"Probably" the reason nero doesn't have the problem is the same as for ImgBurn: it automatically pads the total size. I never remember to pad tiny disks anymore, because I have become dependent on the autopad!
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Firefox 2.0.0.20 is the last ever release for Mac OSX 10.3.9 and earlier versions. <br />Get it here: <br />
https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/
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http://www.mozilla.com/en-US/firefox/3.5/system-requirements/

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Because this is affecting multiple DVD's it suggests a faulty drive. If you were willing to spend a few $ or € and purchase an external optical drive from any electronic shop, that would be a sound diagnostic step to take; possibly a solution and cheaper than replacing the internal drive if counting labour is a factor.

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DVD won't play on Mac

I created a DVD from VHS tape using Studio MovieBox DV and iMove HD. I used MPEG4 file format. I then burned the DVD using iDVD 5. I used a DVD-R disc.
The DVD plays just fine on my standalone DVD player and my pee cee running Windows XP. But it won't play on my Mac unless I turn on the external drive where the video is stored. Otherwise, when I insert the disc in the SuperDrive I get a 'blank disc' message.
Is there some setting I missed somewhere?
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I created a DVD from VHS tape using Studio MovieBox DV and iMove HD. I used MPEG4 file format. I then burned the DVD using iDVD 5. I used a DVD-R disc.
The DVD plays just fine on my standalone DVD player and my pee cee running Windows XP. But it won't play on my Mac unless I turn on the external drive where the video is stored. Otherwise, when I insert the disc in the SuperDrive I get a 'blank disc' message.
Is there some setting I missed somewhere?
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Faulty Transitions (green screen) in burned DVD and no play on iMac

I made my first DVD with iDVD '08 this week and initially all seemed to be OK.
It contains 7 slide shows and 7 movies, total size 4.02 GB.
The problems I have since found are are :-
1. The DVD will not play in my iMac 24", the menus judder or lock up, and the movies judder and skip. When I play the DVD in a real DVD player the menus and movies are fine.
2. On the DVD player the slide shows are OK to start with, having the correct 'Dissolve' transition between sides. The problem is that after about 30 slides the transition is replaced by a green screen between slides.
When I view the DVD in iDVD it works OK, but not when burned.
I also exported a disc image and that also has the same transition issues, so it looks like iDVD is outputting faulty files.
I redid my DVD in a different theme and removed the slide transitions which reduced the DVD to less than 2GB, it seems to work OK now, but I would like to use transitions at some point!
Ian

Ian,
I made a project with only one "drop zone" slideshow by pulling 99 pictures from the media iPhoto window with dissolve transitions.
It failed with about a dozen green screen transitions in the end of the slide show.
I remove one picture reducing the count to 98.
It was good. No green screen transitions.
I saved as .img to eliminate disc problems.
I repeated the test for several themes especially 7.0s which others have found to be problems.
I tested all qualities and both ratios.
With my 20"iMac 99 pictures in one slide show fail, 98 and less work.
I don't understand why your project with slide shows of less than 98 pictures is not working.
Your total project was relatively large and could be a memory error. I suggest testing a smaller project, it won't drive you so crazy waiting an hour or more for each processing cycle.
There are certainly other concerns such as free disc space and RAM etc, and before the latest updates push from iPhoto to iDVD produced different results than pull to iDVD from iPhoto, etc.
History: the 99 limit was the reality that many DVD player will buffer overflow at more than 99 chapters (each picture is seen as a chapter). The original iDVD limited each slide show to 99.
Recent releases allowed as many pictures in one slide show 'drop zone' as desired.
I have been limiting myself to 99 so they will play on most DVD players.
The 99 number and info you quoted from Apple guidelines I find to now be wrong.
They have a bug.
I suggest sending a bug report from iDVD.
I'm an engineer and I've been messing with this for a week trying to get a project out.
Hope this helps
Best wishes
Chris

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Regards
Tom

Turns out that my confidence in Windows Media Player was misguided.
I wrote and said as much to the Microsoft rep who advised me to look elsewhere for advice.
I further told him that from now on, if I meet anyone with the same problem I will give them the advice with which I was originally provided - don't use Windows Media Player.
Heeding the rep's advice, I looked around on the website for the company that produced my DVD drive (Mat****a DVD-RAM UJ-850S ATA Device) and in other forums, I forget where I found the advice but this media player:
Videolan Media Player Downloadable for free at:
http://www.videolan.org/
seems to play DVDs with no problems. I hope someone else might benefit from the information.
Good luck to all

HP MediaSmart DVD won't play anymore (HP HDX 16 laptop)

Three days ago I used it to play a Blu Ray and it worked fine. Now it won't play blu rays or dvds anymore. What happens is when it opens and it says disc is ready to play, it doesn't go any further than that. When I hit the play button, the "reading disc" symbol pops up for a split second and goes away again.
I tried re-installing the program, even to an older version but still no luck. I have the latest version too. I also tried doing some critical windows updates and some optional ones. Bad part is that my laptop is a few months past warranty so I'm not sure what to do next. Any help would be greatly appreciated.

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Dvd won't play in iMac

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