I have bought an Iiyama HM903DT A monitor and I have some problems with it. My pc has Win XP installed and, resolution 1024x768, refresh rate 120Hz. If I turn the monitor off and 5 minutes later on, the screen is smaller than I adjusted before (about 0.5 cm on each side). Please who can tell me what it is I'm going crazy from this. (Iiyama coulnd't help me they gave me some stupid answers).