OK, it seems like the UUID on your hda2 partition changed for some reason. Did you fiddle with the partition? In any case, it should be an easy fix. Let's edit fstab and change the UUID
Now change the hda2 line from
gksudo gedit /etc/fstab
UUID=fc3ae588-c375-4797-9a9a-78ca3e6516e8 /media/hda2 ext3 defaults 0 2
Save and close. Now reboot and it should work ok (it will probably run through the whole disk check, it may take a few minutes).
UUID=e03369a7-6195-4c6e-8594-027d0e8d135f /media/hda2 ext3 defaults 0 2