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I think my screen is faulty or needs to be replaced. When I try to touch one corner on my screen it will register a touch in another corner. Any thoughts?

The reason that your touch screen may not be working is because it may need to be cleaned thoroughly, having a dirty screen will keep the sensors from recognizing your finger. If the device still does not recognize your finger the screen may need to be recalibrated, check out this troubleshooting that explains how to recalibrate the screen.Garmin Nuvi 265wt troubleshooting page