Hi, New to forum and would like some help. I've currently got a Benq projector and Sony blue ray surround sound system. I've just bought a now tv box and plugged that into the surround sound system and then watch through the projector. I get a static screen when I hear the boiler kick in or fridge. If I then unplug the hdmi from the now tv box and surround sound the screen comes back. Is this a power surge? Would appreciate any help.