I have installed LUBUNTU on an old laptop with / mounted on /dev/sda1 and /home mounted on /dev/sda6

However the laptop will not boot from the HDD - a problem with the bios I believe. I can get it to boot successfully by booting from a linux boot cd and then choosing to boot from the HDD.

My question is how can I create a boot CD that will auto boot into the OS on /dev/sda1.

It must be a CD - the laptop wont boot from USB either and I want this to be invisible to the user (ie no menu options to pick) The laptop will be for my very newbie mother in law who will be instructed to never take out the CD!