My old laptop broke down. The screen stays black, but i can still power the laptop, and share the screen with my other mac. I think the graphics card is broken. External screens don't work either, just screen sharing. So, now i want to sell my broken laptop for parts, but i would like to erase the hard drive before selling it. How am i going to do that? I know i can boot from OsX CD and choose to erase the hard drive from there, but screen sharing doesn't seem to work when booting from CD.. Any advice would be greatly appreciated!