I had best buy replace my 160 Gig hard drive in my 2.2 SR Macbook pro and I can't get my computer to work. I got the WD blue 500bg hd. It was installed. I had a fresh time machine backup. I had an install cd for OSX 10.1 (which I figured would be OK untill I was able to get to my parents home and reinstall 10.5 in a few days) and an external enclosure for the old hard drive. Well, when the machine is turned on, the screen turns white. First I tried the time machine backup drive. I start the computer with the time machine drive pluged in. It doesn't work whether I turn the machine on pressing the option key or nothing. If I turn it on with the 10.1 install cd in the hard drive, it doesn't register. So i put my old hard drive in an enclosure and tried booting off of that. I plug the enclosure into a usb port and then turn the cumputer on holding the option key. It won't recognize the external had drive either. The mouse pointer becomes visible, but no disk options are displayed. I don't get it. I don't see how my hard drive that was the computer's main HD untill yesterday would not be bootable. Did they just mess something up? Is there something I am doing wrong? ANy way to trouble shoot this issue? Should my time machine backup be bootable?