Hello All, We purchased a 2013 Touareg TDI in January, 56k miles, just last week our infotainment screen went blank. Pressing the on / off button does nothing. On the gauge panel "navigation starting" comes up but nothing else happens. Same with radio function, telephone. Is there a diagnostic we can run ourselves before we involve the dealer? Since being newbies to the the T, is there something basic we're missing? thanks in advance for your expertise.