did u checked in manual that may have steps to reset to factory default. I hwve same problem. last night I was trying to setup audio/video & by mng. istake I pushed NTSC to PAL then next thing is same thing. now I have flickring picture on tv. I don't have manual to look into detail. I try to find manual to download but can't find it. if u have manual please look into. I'm 100% sure this cause by changing signal from NTSC to PAL.