Monitor flashes and goes black until multiple restarts

So every time I turn my PC on my second monitor flashes for a second and then goes black and if I reset it, it does the same thing but after maybe ten cycles like that it works perfectly fine, if I would turn PC off then and turn it back it would still work fine but if monitor is not working for let's say half an hour it goes back to the same problem.

I tested it on another PC and it was the same

If anybody has some suggestions I would be very grateful