Need more info: Does it not power up at all or does it stick on the intro screen?
You can try a master reset. With the unit off hold your finger on the upper right hand corner of the touch screen and tap the power button. Continue holding your finger on the screen until you see a message "This operation will erase all waypoints, do you want to continue?" (this could take up to a minute)
Tap yes and the unit should reboot then attempt to acquire satellites.
If this doesn't solve your USB problem. Go to the garmin website and download the latest software update, and the usb driver for your model.
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Hi, I don't know whether this may help you, however search for "neadrenalin" and "nuvi" or "service firmware" in gpspassion.com , you'll find a discussion on how to flash firmware even if USB connection isn't available.
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