I agree with what @sunrat says about UEFI or MBR, I don't own a UEFI board, but if MBR
Use a live siduction cd/stick and do the following, make sure you change sda10 accordingly (If copy & pasting these commands, please understand what your doing)
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siduction
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mkdir -p /disks/sda10
mount /dev/sda10 /disks/sda10
/usr/sbin/grub-install --recheck --no-floppy --root-directory=/disks/sda10 /dev/sda
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debian
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mkdir -p /media/sda10
mount /dev/sda10 /media/sda10
/usr/sbin/grub-install --recheck --no-floppy --root-directory=/media/sda10 /dev/sda