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It should go green whether plugged into a car or not. If not, try a different USB port, or run update to make sure the cable is up to date (the firmware occasionally requires updates). You may need to uninstall/reinstall. Also depowering the cable for a few minutes and trying again can help. You can also try a different PC (even if it is a desktop you have no intention of using for flashing) and see if it will work on that one. I've had old laptops with weak USB ports not be able to power it adequately.
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