I have a duel monitor set and a while after I updated to Windows 8.1, it started to flicker for no reason. It is only my second monitor. It flickers whenever the screen has been black for a while. Like when I start the computer or wake it up from sleep mode. I am currently using a HP computer if that helps anything. I have updated my computer to the max but it is still not fixed. Do anyone know what I could do to fix this?

Thanks in advance