Question HP: Get into BIOS without internal Display (it is disconnected and a VGA Display is connected)

[Crafto]

Hi,
the title basically explains it all. I have a laptop with a broken screen. To get into the Bios I disconnected the internal Display and connected an external one via VGA. When I press the Bios key while booting a few times I suddenly hear this "you are already in the bios and you are pressing an invalid key" sound. That's all - no display output.
Model: HP Pavilion G7 2351SG
Thanks in advance!

Addition: I have seen some related problems on the official HP support page, but they were straight up ignored by HP staff

 

[rgd1101]

bios only display to internal screen

 

[Crafto]

Well that's really unfortunate... Although I have seen people on YouTube enter the bios and people reporting about things like disconnecting the internal display.
Bad question; there aren't any "internal display connector to VGA/HDMI" cables?

 

[rgd1101]

not that I know of. they weren't build for that