Turned it off straight away, left it a week, it turns on but display says "adjust vr24 for best readability" .. "ok". I click ok and then display says "check the meter LEDs"... "done". Then "check the leds" and after that "check all buttons/knobs" I continue to press every button and turn all knobs. After all this is done all lights are on and nothing happens. What do I do ????