Extermal display problem - MacBook Pro to Dell screen

Gutti

macrumors newbie
Original poster
Dec 19, 2014
10
0
Faroes
Hi there...
I have an external large Dell screen attached to my MacBook Pro.
Recently the Dell screen shuts off (black screen) every 5 minutes for 2-3 seconds and them comes back again.

What can be the reason for this?

Thanks for any suggestions.