I have a late 2009 iMac i7, with 8GB RAM, SL 10.6.8. It is virtually impossible to play DVD movies on it. I've already had the DVD drive replaced once for an unrelated problem (would not ingest media), and the issue here is that unless the disc is brand new - and I mean right out of the package, it will not play and my iMac will spit it out. That means I can never play any DVD I get from Netflix, even if to the naked eye, the disc looks perfect without a scratch. If I buy a brand new DVD and break it out of the package, yes, it will play. It seems extremely finicky. So in desperation, I bought an external DVD drive, an LG model with good reviews. Well, it's better there - if I insert a DVD from Netflix, I have at least a 50% chance it will play. But half the time it will not. Here's my beef: I have no problem with any DVD I insert into a windows laptop - it plays beautifully, without a hiccup. So what's the problem? Is it a software issue? Are Macs just much worse at playing media like DVDs (I never have a problem with CDs!), or what? Should I just resign myself to watching DVDs on windows machines because Macs just can't manage? What's the solution, and is there one? Thanks!