Screens no longer show a picture?

Hi

I watched Netflix as normal on my pc and then my two screens simply no longer showed a picture even though the pc was still on. I turned the pc on and off and then still no picture showed. After a while it didn't work either on and half an hour later he went back to what should I do?

Mine is so similar that I have no signal. I have now turned to the manufacturer. If you have precise answers, I will be happy to contact you again

Pk thank you