try this first disconnect the negative batt lead from main car batt then remove the connectors from the unit and leave it for 30 min then reconnect the unit then the batt lead and try it this will reset the unit have seen this happen on lots of toyotas and it is the same system in the lexus as lexus is made by toyota if it dont work just get a new unit have seen them for sale on ebay cheap or any electrical repair shop can do it as it is only a dvd player could tell u how to fix the player but will take to long the lazer voltage prob needs turning up as the lazer goes weak hope this helps
tim lewis, September 2007