Macbook Pro isn't booting

[npriess]

My macbook gets stuck at the background with grey apple logo.
The 'loading indicator' or whatever you'll call it is also stuck.

What can I do? :S


EDIT: I can't boot windows xp via bootcamp either.
EDIT: It's a late 2008 macbook pro running 10.5.5 leopard

 

[giovanniP]

try to boot in safe-mode http://support.apple.com/kb/HT1455

 

[npriess]

Safe mode doesn't solve the problem

 

[npriess]

Now, after loading for ages - it finally moved on in safe mode.
What should I do now?