Firstly, my computer started having a frequent need to Repair Permissions so I decided to do a reinstall. When I put the install disk (10.6.6) in the Superdrive and rebooted with C pressed I got a flashing circle with a line through it similar to the international do not enter or nought, followed by a folder? followed by an apple sign that is stable and a grey screen with no further activity. The superdrive then stops.
When I hook up an external DVD drive to the firewire and attempt to start the computer this way the exact same thing happens. Drive Genius also behaved the same way.
I was unable to boot form any of the disks.
Macbook Pro Mid-2010