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2 things that might help...use a paperclip and press the reset button (small hole on side, you'll feel a click) hold it for 5 seconds. THEN hold down the power on button for over 10 secs (keep holding while it shows version number) and it will perform a factory reset. You will likely lose any settings and addresses, but better that than no GPS unit.
See if you can find the reset button on the unit and push it while the unit is on. On newer units the reset button is on the back, but on older units it may have a faceplate cover around the edge of the screen you have to remove and the reset button is sometimes located under the faceplate...this may work