Re: UEFI Motherboard dual boot/dual HDD
My inspection of your boot info script shows that your system seems to need only a simple BIOS boot. It shows the boot loader on sdc? You do not appear to understand how grub functions and may have over complicated your installation. You have already apparently spent considerable time trying to untangle your system. Consider it time well spent a a learning exercise.
I suggest the simplest approach is for you to abandon your prior efforts and simply reinstall! Just make sure you this time install grub to the MBR of either sda or sdb and make sure the chosen drive is selected to boot first in the bios. A dedicated boot partition is unnecessary and only complicates your setup. Also the uuid of the partition you install on should also be the location of your kernel (ie /vmlinuz-3.5.0-17-generic root=UUID=.....etc). I see no reason why your system should not dual boot if grub is installed properly. A simple installation should require less than 20 minutes a clean up all your problems. Do select 'do something else' on the third screen and then select sda4 to install / to and sda or sdb to install the grub MBR to. Let us know how you make out.
12.10 Quantal w/grub2/Mint13 installed on raid0, Gigabyte AMD MB, AMD 64x4 CPUs at 3.2GHz, 16 GB ram, HD7770 ATI video, dual boot win7 on 64gb ssd and win8 on 1Tb SATA raid. 13.04 installed on raid0 and ssd