I am assuming your working distro is PCLOS. Boot it, type "kdesu kate" in the run dialog, and navigate to the hda2 partition, it may be called sda2. This should be the Mint / (root). Open the file called /etc/fstab. In that file you will see your auto mounting lines. they should look something like this:
UUID=ef909b66-06ba-4509-93fd-3e5c4a875a30 / ext3 defaults,errors=remount-ro 0 1
UUID=179531d8-4df6-494c-91f2-e0295be69b04 /home/denise/Backup ext3 defaults 0 2
Some or all the UUID number are incorrect. In a terminal type:
sudo vol_id -u /dev/sdxx
Substituting the appropriate drive and partition designator for sdxx. Do this for each partition listed and change the UUID in the fstab to the correct ones you just calculated.
Save and exit. Reboot and Mint should come up fine again, unless one of us made a mistake.