If nothing happens at all when trying a hard reset, (hold down on power button while holding lower right corner of touch screen), your battery may be flat or dead.
This could happen due to unpowered USB port on some PC's, which allows the Nuvi battery to go flat during an update. Although I wouldn't think that the Nuvi would connect to the PC without a powered USB port.
Does the GPS power up at all when connected to a power source?
If not you could try the hard reset while connected to power source to get it up & running then abort the reset, when "Erase all user data?" appears, touch no.
Or say yes to restore to factory defaults, this will erase your favourites, no big deal.
There is also another procedure that provides a service mode handshake and then prompt for a screen recalibration.
Hold power button while holding upper left of screen, maybe that will wake it up or get you connected to your PC.
Good luck.
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