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My touchscreen on Garmin nuvi 1390 not working too and .calibration it's help alsoI did twice hard reset my GPS Garmin Nuvi 1390 and nothing happening and after I tried different trick,when I turned GPS off I hold the top left corner screen.The screen exchange for calibrations and I pressed several times according request and my GPS Garmin Nuvi 1390 started work,but repairing company wanna charge me $100 Canadian dollars.I didn't connect GPS to computer