Laptop with broken screen won't connect to external monitor


my old laptop (HP Pavillion 15) fell off the table and the screen was broken as I picked it up.
The mechanical part of the lid was broken too, so I decided to connect it to my external monitor via VGA and HDMI, but there was no signal. The laptop is starting, but there's no signal to the display.
I can't try to close the lid while it's starting, because the lid is broken, so I opened my laptop and took the whole lid out, so it's practically only the bottom part with the keyboard now.

I tried to connect it again to the external monitor but it's still not sending a signal.
Any ideas what I can do?

Laptop - HP Pavillion 15, Intel Core i7, AMD Radeon Graphics. Windows 8, No Guaranty available.