Hi everyone. Here's the story.... I have a 15" Macbook running 10.4.11 and I was given a Mac Pro to use by my boss who is upgrading to a faster system. He completely wiped the drives when he gave it to me so he suggested I just directly clone over my existing Macbook drive onto the startup drive of the 8-core system and start using it, which I did, using Carbon Copy Cloner. The system boots fine, it works great, Logic works fantastically better than it did before -- except that I am getting unexplained crashes in all sorts of programs. First I thought it was only happening in Logic, but now I'm noticing, it's also happening in Safari, Firefox, MS Word, Excel, and also, VLC Player will not show video for certain codes now, and if I try to enlarge a video to the full screen the file will crash. i can't tell when a crash is coming - the program will just vanish after i click on something, for no reason. Sometimes there's an error message (which usually displays "KERN PROTECTION FAILURE", or something like that?) but sometimes there's no error at all, the program just closes with no notice. I am trying to avoid having to buy the full version of 10.6 as that would mean probably having to buy Logic Studio (as my current version of Logic, 7.2.3, is not tested for Snow Leopard), for a combined cost of $569 plus tax. EVentually I might be wiling to do this, but for now I'm wondering, what can I do to make my system more stable -- or is 10.4.11 just not meant to work on 8-core systems? Here are details of both systems from system profiler: original laptop Macbook Pro 15" Intel Core Duo 1.83GHz 1 Processor 2 Cores L2 Cache per processor: 2MB Memory: 2 GB Bus Speed : 667 MHz Boot ROM Version: MBP11.0055.B08 new desktop which the laptop drive was cloned onto: Mac Pro Quad-Core Intel Xeon 2.8GHz 2 Processors 8 Cores Memory: 6 GB Bus Speed: 1.6 GHz Boot ROM Version: MP31.006C.B05 Any help beyond "just buy the new software and get it over with" would be much appreciated Thanks!