So, I just installed more RAM. Now I can't boot (properly) into xubuntu.

When booting I'm greeted with something along the lines of "Failed to load /boot/efi, press S to continue or press M to manually recover".

If I press S it loads, but everything's wonky - my wireless mouse doesn't work, my extra monitor isn't automatically added, and my background reverts to the default xubuntu one (after briefly showing my actual background!)

The drive is partitioned, I have xubuntu, windows 8.1 (properly set up, as far as I know..) and a partition for shared files between the two. In /etc/fstab it lists /boot/efi as the mountpoint for /dev/sda2. GRUB also lists /dev/sda2 as the windows bootloader point.

Any help is appreciated, I'll post whatever logs I can get from the recovery console at request.

EDIT: It seems that the RAM is fine, as far as I can tell. The BIOS is recognizing it fine, and windows is running well (that's what I'm typing from now)