My second monitor turns on then 2-3 seconds later the monitor goes bla

My second monitor turns on then 2-3 seconds later the monitor goes bla

My monitor just goes black and it says its still on the problem ISNT the monitor itself because Ive hooked up another monitor and it did the same thing I have no idea why I have a Radeon RX 480 if anyones wondering it has never done this in the 2 years ive owned this