In short, stupidly let dd "work" on my laptop attached to AOC monitor. Within seconds, she clearly hit some dodgy key and now the picture on the laptop doesn't show. I get a grey screen, but I do get the samsung logo from the laptop showing something is getting through. When i hit the menu keys it does something like a reboot with no success 
AOC customer services are useless, so is the manual which is impenetrable to non geeks - and I don't think contains the solution anyway. Can anyone help? I am sure it's something tiny that needs adjusting but I get terrible backache working on a laptop so am on the verge of having to buy a new monitor for what I'm sure is easily solvable
Thank you!