My MBP 2007 very reliable, 2.17ghz, Intel, with Snow leopard, boots up fine but then freezes. No keyboard or mouse functions either. Tried resetting Pram, booting from external would not recognize drive. Target disk mode would not work because of keyboard frozen. Tried to boot from disc, would not open disc even though disc shows up on screen. Tried at startup: option key, c key, etc. keyboard commands not recognized. Tried plugging in keyboard...nothing. Don't know what else to do guys, little help. Thanks