Hp probook 445g1 display issue

[Windows Central Question]

I am facing trouble with the display of my laptop. When I turn on my laptop for the first time, there is no display. But as soon as I connect my laptop to a monitor, there is a display. And now when I am restarting ( second time) the laptop from the monitor, I get the display back on my laptop screen and it vanishes from the monitor screen. The process continues in the same way.

P.S. : The display again vanishes from the laptop screen when I restart for the third time. I am using Windows 10.1.
Please help!