Laptop won't post without original screen

[Keagan554]

Hi

I am trying to make a DIY computer from an old laptop like Matt did on DIY Perks here...

https://www.youtube.com/watch?v=e3fnsGHe8eE&t=458s

 

I am also trying to salvage the screen to make a portable monitor like he did here...
https://www.youtube.com/watch?v=CfirQC99xPc

 

So my problem is that the laptop wont post at all without the original laptop screen in place, once I plug the screen in and it posts then I can unplug it and use it ass normal with a secondary display.

I'm thinking if I can get something to plug in instead of the screen it could fool the pc into thinking theres a screen plugged in and then it should post, but I dont know what that would be called.

If anyone has anyideas that would be great.

 

I am using an Alienware 15r (I think its 2014 or 2015) GTX 970m, i7, 16GB ram.