I used a PC running Windows 7 to complete a map update on my Garmin nuvi 1690. The map update process appeared to be successful; however, now when I turn the GPS on the maps will not load. All I can see is the 'Garmin' logo on a black screen. My attempts to perform a reset of any kind have been unsuccessful. Additionally, the PC no longer recognises that the GPS is connected.
Your urgent assistance is appreciated as I am moving house in one week.