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HP Probook 450 G2 won't show bios on second display

Mr Technician
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My HP Probook 450 G2 recently had a screen failure and I opted to re-purpose it as a computer for watching youtube on connected to my TV. I first wanted to reinstall windows but have been unable to get to the boot menu through either VGA or HDMI. However, windows will show up on the second display without issue. I've torn down the laptop completely, so it's just half the shell and the motherboard, with the main display disconnected, but it still thinks the display is there and I believe the boot menu and/or bios are appearing there instead of my secondary screen. Is there any known way to make the laptop realize that the primary screen is indeed disconnected? In the device manager I see a "Digital flat panel (1024x768 60hz)" along with the generic pnp monitor that is the second display, so windows sees it to but is smart enough to recognize both (on first boot it was mirroring, and I have since set it to display only on the second monitor).

PC Specs:

CPU: AMD 1700x Cooler: Corsair H100i V2 Motherboard: Asus Crosshair VI Hero RAM: 4 * 8GB G.Skill RGB DDR4 Graphics: EVGA GTX 1080 Ti SC2 Storage: Samsung 960 EVO 500GB Case: Fractal Design Meshify C PSU: EVGA 750w G3 Monitors: Dell SG2716DG +  2x Dell U2515H

 

Freenas specs:

CPU: Intel Xeon E5-2650 V2 Cooler: Some noctua cooler Motherboard: Supermicro X9 SRL-F RAM: 8 * 8GB Samsung DDR3 ECC Storage: 6 * 4TB Seagate 7200 RPM RAIDZ2 Controller: LSI H220 Case: Phanteks Enthoo Pro PSU: EVGA 650w G3

 

Phone: iPhone 6S 32 GB Space Grey

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