Grub

ls

show devices

(hd0) (hd0,name1) (hd0,nam22) (hd1,name1)...

On the installation disk check where vmliuz and initrd are located

Load and boot a kernel

linux	(hd0,name1)/<path to>/vmliuz   boot=<path to> quiet  ---
initrd	(hd0,name1)/<path to>/initrd 
boot