Can't boot 14.04 after motherboard replaced

Hi,

I have a dell XSP 13 ultrabook which has ubuntu 14.04 installed (as the "only operating system" on the machine - windows was wiped when I did the USB install) and I had the install use the "encrypted drive" option.

I have not done anything special in regards to the boot system, everything is still default.

Motherboard was replaced today, and now on boot it says "The operating system caot be detected."

SSD is still detected in BIOS, I have also tried booting with "legacy" as well as "UEFI", and UEFI with secure boot mode "enabled" and "disabled", but each time "The operating system caot be detected."

I also went through the recommended boot-repair option (this was done ruing from a LIVE-USB), I tried the reboot but nothing.

So here is the recommended paste to show ubuntu forum heros, to see if anyone can point me in the right direction from here.

http://paste.ubuntu.com/15682559/

I am also OK to follow a commend line tutorial if there is anything that can be recommended.

Thanks.