grub-install /dev/sda problems.

[Mickey]

F15

Setup F15 hard drive on a different computer /dev/sda and sent hard 
drive to a friend to put in his computer as /dev/sdb , behind WindowsXp 
and went into the rescue mode to run grub-install /dev/sda , getting a 
error message;

"Does not have any corresponding BIOS drive".

Drive is recognized by BIOS as a Slave.

I guess the Device map is different and causing problems,   How do I fix 
this to get boot sector on /dev/sda