Powerbook G4 Help

[quackers]

The mac seemed to crash yesterday as i tried to shut itunes down, the disc sat there spinning for 10 mins +, so i held the power down and tried to restart.

All i get now is the box with the question mark in the middle of the screen, i'm a bit of a mac noob. Anyone got any suggestions?

 

[quackers]

Any ideas how long that takes? When exactly do you press the keys?

All i get now is the Apple logo on a greyish screen