Elaine just walked in and said "my mac just died". Indeed. It's an old Macbook Pro, and when trying to start, all we get is a grayscale square with a text about how the computer needs to be restarted by holding down the power button. My first guess is that it might be the hard disk, but I know *nothing* about Macs - anyone came across this? Any advice and/or ideas?

Julf