I have a Dell Latitude D600. I've uninstalled windows completely and have had ubuntu 11.10 running on it forever. now suddenly it decides not to boot. so i tried to boot from a live cd i burned and it registers on my other windows computer but when i put it in my Dell it says there are no bootable devices (after disabling booting from the hard drive) I'm really not sure what the issue is. it seems that my hard drive is in read-only mode? not sure how to get out of this as the only thing i can do is to use the grub command line. Any ideas?