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The GO 720 charges quite slowly when attached to the in-vehicle cigarette lighter cord. If you have a USB attachment (that allows you to connect the GO720 to your computer) just insert the GO720 into the USB cradle - you don't have to turn it on - and let it sit there for about 10 hours. You should see the green light on the GO720 indicating that power is being received. In fact, I don't think you even need to turn on the computer, as power is always fed to the USB circuit. If you see the green light, then the GO720 is being charged. I think your GPS just needs a good charge.