Startup problem.. Help?

[AndySollel]

I've been using an iBook G4 with Mac OS X for a while now, and never expirienced any problems but today When I attempted to start it up , It freezes on the screen that says "Starting up OS X.." once the loading bar reaches the end.
I've tried alot of different things to get it to work.. but nothing seems to be helping.

Does anyone know what might be the problem or anyway to solve it?

 

[Satcomer]

Try the Hardware Test on your original install disks. You have a hard drive kicking the bucket or a fried RAM chip.