I have the nuvi 265W yesterday I accidentally deleted partition and formatted the unit fat32, now when I turn the unit on it shows the garmin boot screen then goes into a reboot loop, if I put a sd card in the slot it will boot into the unit and I can get to the menus. When I plug the unit into the pc the unit beeps like it charging but the pc does not see the unit, if I hold my finger in the top left when powering on and plug it in when I see garmin on the screen windows will do the ding dong sound like it found the unit but if I leave my finger on the screen to long the pc will ding dong again like the unit disconnects from the pcand the calibration screen will come on. I cant get to preboot at all. PLEASE HELP....