System freezing in apple's logo after first reboot o the same with the forbidden sign.

I've managed to install it changing options, and using an IDE hard disk (I think the problem was nforce's sata driver not working properly). I'm dealing now with my ps/2 keyboard (everything works fine except for the keyboard), but it's a matter of time to find it out, because I only have 3 different options for the keyboard, and I'm installing using one at a time, so I cross my fingers in order to be able to use the keyboard

Thanks for your answer