I have switched SATA controller mode from IDE to AHCI, and my Fedora (the latest release) doesn't boot now. I'm not surprised by this fact alone, but I am surprised with the message I'm getting:
BOOTMGR IS MISSING
Which, I believe, is BIOS message, not OS message, so Fedora doesn't even start booting (unlike Windows). Why am I'm getting this message, and is there any way to enable AHCI without reinstalling Fedora from scratch?