One day, when I turned on my car's ingnition, my GPS didn't start appropriately and went with a black-white checkered scrren. And, any of button doesn't work including the power button. (The power button only worked when turned on) I dodn't have any firmware to download to figure out that it would be a problem of hardware or software. Everytime I turned on its power, same thing happened.
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The actual freezing problem can be caused by the GPU overheating and SO can the no display error as well. For an in depth look at how to fix both of these problems see this >
red and black are power and ground, blue and white are gps output signal connect those to 9 pin connector pins 2 and 5 and get a 9 pin(serial) cable to usb adapter for input to a laptop, charting or mapping program and you are good to go. just make sure if you are using xp to wait until the mapping program is running and searching for gps signal before you connect the serial or usb because windows thinks the signal is from a mouse and the cursor will turn into a raging crackhead jumping all over the screen and randomly clicking on whatever it touches.
I turned it off, then took the battery out for 5 minutes then put in back in and turned it back on, this should work, however for me it didn't so i turned it off and on again on doing this it went to the normal loading screen
This problem has happened to me before turn the gps unit over and clean off the gold colored conductors on the bottom take a paper clip and touch the 1st and 4th pins together this resets the unit be sure it is the 1st and 4th pins on the opposite side of the little power connector though.