I suggest you look at the grub file, it may not be pointing to the
correct disk sector where the two linux boot up files reside. ( I get
this as I have an IDE drive and a SATA drive and Grub always makes IDE
0 which in my case should be 3) Press 'escape' during the Grub boot up
and you can then edit these sectors. Lots of Grub help about if you
search those errors.