GRUBがインストールされている場所(たとえば、どのドライブ/パーティション)かを見つける必要があります。どこにインストールされているかを知ることはできますか?
Boot Info Script を見てください。
# ./boot_info_script.sh
boot_info_script version: 0.60 [17 May 2011]
Identifying MBRs...
Computing Partition Table of /dev/sda...
Computing Partition Table of /dev/sdb...
Searching sda1 for information...
Searching sda2 for information...
Searching sda3 for information...
Searching sdb1 for information...
Finished. The results are in the file "RESULTS.txt"
located in "/root/".
そして結果:
============================= Boot Info Summary: ===============================
=> Grub Legacy0.97 is installed in the MBR of /dev/sda and looks at sector
178241 on boot drive #1 for the stage2 file. A stage2 file is at this
location on /dev/sda. Stage2 looks on partition #1 for /grub/grub.conf..
=> No boot loader is installed in the MBR of /dev/sdb.