Ok, our '99 Honda Civic EX has a Alpine CDA-7893 flip down screen, removable face plate heat-unit with hidden CD player. It has a 6 cD in the trunk and Alpine 6X9's with cross overs and Alpine 5 1/2 up front. Once a month the head unit will power up and not play ANYTHING from any source, at any volume? It reponds to teh keys with the screen and everything but nothing comes out of the speakers at any volume. Even if you turn teh unit off and on again no luck. Then you start the car the next day and it works great again for another month!!!