I've got my new Mac Pro up and running. After a little bit of work I get all my files, applications, licenses up to date. When I finally have my hard drive exactly like I want it, I back it up to a second hard drive. The next time I started my computer I ended up with the blue screen of death. Nothing on the monitor but blue, seas of blue. I tried starting up from my back-up hard drive. It's a clone of my hard drive so sure enough, the blue screen of death. I put in the Leopard install DVD and did an "Archive and Install." That worked and I am now up and running. It sounds like Unsanity LLC is to blame. They have something in the system folder called "ApplicationEnhancer.bundle" which is causing that "BSOD" Thank you, Unsanity.