type r gt sat nav 07?

hi can anyone help,,,when i switch ignition on only, my sat nav lights up and works ,,but when i hit the start engine button it goes blank ,,although the stereo and climate control and sat nav are still working ,i cant see them as the screen goes blank,,when the engine is warm and i stsrt the car the screen just flickers quickly and goes blank

davy watson
January 2014