I don't know if this is the same as the non-responsive screen issue, but many of those posts seem to be related to bad calibration.
When I power on nuvi 650 (serial #14V...) it comes up with "Map Update Notice" and tells me my maps are more than a year old. There's an OK button in the corner but nothing I do will make it respond. I've pressed everywhere on the screen (in case it's wildly out of calibration) but nothing.
I tried hold the power button until it reached Pre-Boot Mode and asked me to touch a dot in bottom left of screen, but that was nonresponsive. I've also blown out around the screen with a can of air.
Is there anything else I can do? I think it's too old to waste money swapping for another 650.
Thanks!
=aw