I have a Lenovo U410 and it comes with one of those intel hybrid HDD's that has a 32GB SSD in it. I figured I would unraid it and try out Ubuntu on it for the first time.
I got it installed and working, but when I tried to get back into Windows, I got an error about EFI table (I think that's what is was). After that, I tried to repair the MBR as I decided I didn't want to run Ubuntu on my laptop.
I can't get Windows back, and I can't even access the BIOS to try and repair Windows. Everything I try and do seems to break things even further and I have no idea what I can do.
Booting goes straight to GRUB and I can't access BIOS.
I have tried using boot repair to fix MBR but I think I made it worse.
Best Answer
Hold down Fn+F12 while booting and you should be able to boot to any installation media (i.e. Ubuntu USB stick)
When setting up Ubuntu, make sure to set up an EFI boot partition. You usually will need to choose "something else" in the options for partitioning it. I have my U410 set up like this:
SSD
Efi boot partition
ext4 filesystem (mounted as /)
HDD