Lately my laptop(hp g42 247sb) screen is damaged, so I hook it up with a external monitor(LG something) and it works fine now.

But the only annoying thing is I cannot navigate the BIOS menu for some tweaking because the BIOS not shown on the external monitor,instead, it only shown on the broken laptop screen, and it only output to my external monitor when windwos/os is loged-on.

So, is there anyway I can force output during BIOS/BOOT/POST to my external monitor?

Things I have done and didn't work:

(1)Set my LG monitor as primary display on both window properties and Intel Graphics panel

(2)Enter the bios (F10 key) and press the fn+F4 key(change display output).

(3)Disable and uninstall my internal screen(broken laptop screen) using device manager and restart, but windows(bios?) install it back on log-on.

Please help me!