My knowledge of Linux is limited but a few questions first to see if I can help, there are people here on PCA that will have better knowledge than me.
Hi you have installed Linux Mint 9 Lxde onto your ThinkPad E600.
Is there any other windows based OS on the HDD.
Is it the original HDD that will have all drivers on it?
You have a Win XP also on a HDD does it have the drivers loaded on it for the ThinkPad E600, was it loaded by the ThinkPad E600.
What happens when you press F1?
When holding down the F1 it's for cold booting (not a restart) to enter the BIOS set-up screen.
Do a Google search for the motherboard and see if you can find some instructions.
The disc it is asking for will be a Boot CD disc for the ThinkPad E600 do a search on the net and see what you can find.
Type Linux ThinkPad E600 boot disc.
Has the CMOS battery died?