Just recently my Mac Pro has started to give me trouble reading DVDs. The DVDs are fine as they read perfectly on my MacBook, but on the Mac Pro, they just spin up a bit in there and never load. Every once in a while, a DVD will load just fine, but for the most part I can't get DVDs to play. Any ideas what it could be? Edit: I think I've noticed a pattern. CDs and single-layer DVDs load without a problem. It's the newer Dual-layer DVDs that just sit in there and fail to load. I remember hearing about a similar issue in Nintendo Wiis and that it was because the drive was probably dirty. Any tips on how to clean the drives and test that out?