I have just now received my purchased 13.3 inch Macbook Pro model, with BTO 4Gigs RAM, and 250 HDD. I opened the Macbook pro, and it worked just fine. First thing I did was to enable the WiFi, perform a software update, and update the system using Software Update with the combo update to Snow Leopard 10.6.2 (it was 10.6). Immediately after performing the update and restarting, the computer crashed on startup 3-4 times, and still refuses to boot. It appears this is a kernel panic, with the first line saying "Panic Version mismatch between Kernel and CPU " and some other things like the version of the system and darwin, and the CPU model. I booted from the DVD without problems, and performed a Disk Repair (which found no problems) and a repair permissions (which also found no errors). Strange thing: When I selected the "startup disk" application I selected my internal HDD but it displayed 10.6 instead of the recently applied 10.6.2!! Rebooting still crashes the computer, with the same kernel panic... I would very appreciate any information on this problem. Could this be a defective RAM or HDD? Or is it a falsely applied update?