Not much in the way of a description of what is happening.
So here is something that can happen and is easy to check and correct:
You may be encountering a UUID miss-match problem. Grub won't do much for you when it happens. What to do to find out and fix it, if that's the problem.
Do the following in terminal:
sudo vol_id /dev/sdxy -u
Where x=a if the primary drive in a multi-drive rig, and y=the partition number of the drive (it's the location of the offending partition - I assume that is the partition you installed Mint on).
Note: If you are using IDE drives then the you would use: sudo vol_id/dev/hdxy
The output of this command will display the UUID of the drive (sdxy or hdxy). It's a good idea to run the id command for all the disk numbers and have them handy because you need to compare them to the UUIDs listed in the fstab file. To list and change the UUIDs listed in the fstab file do the following in a terminal.
Enter the following command in terminal to display fstab in a text editor:
sudo gedit /etc/fstab
Compare the UUIDs in the fstab file listing with the list of UUIDs you got from the vol_id command. If you find one in fstab that isn't the same UUID as the the one listed by the vol_id command, edit the fstab UUID to match the vol_id command.
Personally, I agree with a previous Mod from the board: "UUID's make matters unnecessarily complicated by being "unique" ..." See this post. It will give you the rationale for why device names are preferred over the UUID strings.http://www.linuxmint.com/forum/viewtopi ... 2001#25955
I hope this gets you up and running.