System bootup question

Hello , i've managed to mess up my startup disk settings and now my ibook wont boot!! Can anyone help? It gets to the Apple logo with the dial loader thingy and doesn't go any further.

I would try booting from your system restore disc, run disk utility to verify and repair the disk and permissions.

or you could try starting up in safe mode (Shift ket on start-up chime)

Hello I've tried both method, however i'm not quite sure whether I'm doing the 'shift' key method properly. Any extra help would be wonderful..

when it goes ping (start-up chime) hold down the shift key (not caps lock) until you see the safe boot screen.

If this doesn't happen use cwa107s method of booting up using the install CDs (press C on start-up to boot from a DVD)