Hi! Thanks for looking

I have borrowed this notebook off my dad and since I got it home I've been unable to log on to it because after SUSE loads up, all that shows on the screen is one block colour that changes every 5 seconds or so.

I think this may be because I was fiddling with the graphics settings to try and get the 3D desktop to run, but I don't remember exactly what I did

As I see it I have 2 options,

1 - Re-install (or system restore)
2 - Reset the graphics settings...

Sadly I know how to do niether, I've been searching for a solution for about a week now and can't find anything

Any help would be so appreciated!
Thanks