[all variants] grub error 15

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http://ubuntuforums.org – This started with a dvd swap. Gigabyte GA K8NS 939 ultra mother board, has 4channel pata, and 4channel sata. 2 Sata HD, 1 pata HD, 1 pata dvd, 1 sata dvd. Tried to replace pata dvd with new sata, but could not cdrom boot through sata channel, so, I put the pata dvd back, then grub 15 error. Been trying fixes including Suse disk. After aborted Suse fix, it booted again. Then last night, I removed the 3 HD's and put a different empty 500gig HD in and installed Mint 13 on it. I then took it out and replaced the original 3 HD's and now get the same grub 15 error. Tried fsck, and replace/install gr (Hardware)