Help! When turning on my Nuvi 2595, it goes to the Garmin screen, shows "loading maps" below, and then shuts down. Takes about 7 or 8 seconds. Also, when first turned on, there is a continual faint buzz until it shuts down. I tried doing a reset by pressing the lower right hand corner on the screen while turning it on. Still just shuts down. Any suggestions? Tried with the memory card in and with it removed.