After booting from the installation disc, the left shift key worked with w for about a week and a half, and then it went on the fritz again. Took it to a Genius bar and, of course, it worked for them, I'm assuming after i had turned it off for some time. Now when I try to boot from the disk it does not work and when I restart or turn off the computer is still does not start. Some weird software issues going on here. Any input form anyone with a similar experience would be apreciated.