Trouble booting after running installer on PC

Hi guys!

I have an old Lenovo H505s that I’m trying to install Lakka on as the only OS.

I can get Lakka to boot from my flash drive no problem. Both the live mode and installer mode.

After I run the installation on my hard drive and reboot I get the “No OS found on device” error.

If I use Super Grub I can boot from what it finds (even without the USB stick inserted). So I know the system is capable.

I tried running boot-repair from an ubuntu live session and it says it was successful but still nothing.

My guess is it’s a boot loader/manager problem but I’m at a loss on how to mess around with/correct that.

I’ve had ubuntu installed on this system before and it would automatically load from the hard drive and I just want lakka to be able to do the same (I’m not trying to dual boot or anything).

Any and all help is appreciated