Mac Pro doesn't read DVDs, show them as blank DVDs.

I am running an older Mac Pro with OSX 10.6.8 software. I have been trying to play DVDs through my internal disk drives but everytime I insert them my mac shows them as blank dvds in the finder, even though they play on other machines. I do have an external disk drive set up as well that does read the disks just fine.
I have read through many different forms from different sites and have found similar issues but no solutions. I have tried updating, blowing out the drive with a can of compressed air, yet nothing makes a difference. At first I had thought that maybe the drive had gone bad, however this is happening to both internal drives at the same time and therefore makes me belive that it is a software issue.
As I said, my mac recognizes both drives (SONY DVD RW DW-D150A) but shows the disk as a blank disk with no data on it. I use my disk drives daily and have not done anything new that would have changed the software process.
Please comment if you have any solution. I have yet to find anything that remotely answers my questions. Thank you.

Hello
Maybe the upper and lower filters must be removed in Windows registry... Follow the instructions in this Microsoft article:
http://support.microsoft.com/kb/314060
And try to clean the ODD laser because it could be dirty.
Greets

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I read your links, if I understand correctly, it may work with Dual Link DVI adapters?
My monitor connections are:
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"Guy with 10k Mac Pro and FCP can't find the right forum to post in?" Need a flashlight?
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persyna wrote:
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Mac Pro doesn't read DVDs, show them as blank DVDs.

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