Hi,  I have an Inspiron 15 7559

The problem is when I switch it on the screen is black, I have connected to an external display, so bios loading appears on that. Then bios screen appears with 'Unsupportive Display device found", I click continue. Ok, windows boots. If I want the laptop screen I have to as shown in the GIF. And screen goes black time to time.

Could you please suggest me a solution? TIA. Tharanga

This is what happens!