The monitor clicking off and on is a common event.
It is just the screen refreshing the rate between booting up and entering windows.
The only thing that may help is trying to adjust the refresh rate. (not any lower than 70)
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.