Comment 91 for bug 1082418

Actually, this crap happened me many times and I was able to solve after burning a mobo just to figure out what was happening. PLEASE READ EVERYTHING BEFORE DOING ANYTHING!

When the system has not grub installed everything is ok, but after the install efi is destroyed. The only way to solve it is to jumper the two pins under the ram, it will reset cmos and efi. Then you have to create a freedos bootable usb stick with the bios updater on it. Pay attention that 1.x can't be updated to 2.x, so check twice for the exact bios version.
Then flash the bios.

Now reboot the computer. It will automatically check for any bootx64.efi in Boot folder in the efi partition. If you have something there, it will boot it.
In the case you want to reinstall grub you can, but in order to AVOID TO REPEAT EVERYTHING just remove the efibootmgr and efivars packages, without them grub-install won't touch the efi entries.

If you have any questions please ask, maybe i have some news since I am still trying to add a standard entry as i used to have.