T410 boots to external monitor...or something...

[T410]

This doesn't seem to be a Linux problem, although i use Mint. I transferred my old hard drive from my T410 to a new T410 a couple months ago, and every time I boot up and log into Mint the screen goes black. I have to Fn F7 which I presume disconnects the external monitor that I don't have. Is this a BIOS setting or sumpthin? Never happened on my old unit

[T410]

The only thing I can find in BIOS is set to "Thinkpad LCD"

Other options are Analog VGA
Digital Thinkpad
something else