Hi ! I traded my Mac desktop for a MacBook Pro A1211 and after playing with the laptop for a while I ran into a problem. (Operator error ?) I turn it off for a few day and when I turned it on, instead of a apple logo I get a folder with a "?" mark flashing. It sounds like the hard drive may have died. I have another hard drive, but......... Thing is, I have a perfectly good copy of Snow Leopard but it will not boot from the internal DVD. When I hold the option key down, I get a mouse pointer but no devices. And the DVD will eject. With either the new or the old hard drive installed. I even hooked an external USB DVD drive but that doesn't show either. I hear both trying to read the OS disk, but nothing else. And the disk is find, I just used it a few months ago to put the OS on a older MacBook. I've tried holding down the "C" key, the "Option" key and CMD + Option + R+ P and nothing has worked. Help !!!!