@Russ Any idea on what piece of hardware might be causing the issue? If not no worries

@Russ Is it possible one of my apps could be preventing it? Such as Wallpaper Engine which creates live wallpapers.

@Russ said in Turn monitors on and off:

powershell (Add-Type '[DllImport("user32.dll")]^public static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);' -Name a -Pas)::SendMessage(-1,0x0112,0xF170,2)

When I try and run the turn monitors off command, it works briefly, but my screen wakes up after maybe three seconds. While my monitors are off my keyboard and mouse flash rapidly at me. Any idea on how to fix this?