You have some editing to do. You need to edit Mint's /etc/fstab and correct the partition assignments in that file. If you are using UUIDs, they will need to be corrected.
You also need to edit /boot/menu.lst of Mint and/or the other distro you are using to boot with, and correct the "root" and "root=" entries to reflect the new partitioning.
Okay, I had already fixed Mint's fstab and the deleted partitions are no longer mentioned there.
But, ah, yes, in the other distro's menu.lst, I still have
And it should be root=/dev/sdb7. Is that all there is to it? Check this out, I fixed part of Mint's entry in that menu.lst but missed the other part:
title Linux Mint, kernel 2.6.22-14-generic (on /dev/hdb7)
kernel /boot/vmlinuz-2.6.22-14-generic root=/dev/sdb11
ro quiet splash
Silly mistake. I'll try it now.