firmware update nightmare.

Reboot and Select proper Boot device
or Insert Boot Media in selected Boot device and press a key
No bootable device -- insert boot disk and press any key
i was updating the desktops BIOS using the ALiveNF5SLI-1394 Bios package from ASRock. then teh fans went to full speed 😂 since then, black screen. im reasonably technical but Ive never had to recover a BIOS 😤 is this repairable at home? the keyboard lights flash briefly when i press power, then nothing. i have another computer available to download files and prepare a USB stick if a recovery procedure needs it. i just dont wanna make things worse by guessing. any ideas??