by hikaru » Sun Apr 13, 2008 8:46 pm
This sounds like either your hard disk or the graphics adapter is defective. I think it is the HDD.
I recommend you to save your important data to an external storage (USB-stick, another disk).
Since you can't boot from your HDD anymore you should boot from a LiveCD or take your HDD out of the notebook and attach it to another computer via an adapter.
Then you should check your HDD with Checkdisk (Windows) or fsck (Linux).