Found the answer for the power-button: You can turn it off with the Lg fortemanager.
http://www.lg.com/global/fortemanager/f ... CTG1000439Just tried it on my lg d2542p and it works like a charm + many more options (sharpness etc.)

Edit: Tried hdmi today with the pc and found that the forte manager isnt working anymore. After goin back to dvi everything was fine again.