On Driod razr, I see a question mark inside a big battery icon when trying to boot, either into recovery or normally. I made a factory cable according to instructions and also have a cable that came with the phone, which I presume is the oft-mentioned "factory cable" Neither cable, neither plugged in to a computer nor a wall charger, and left for hours, does any good. When I plug in to a computer, I see the white light, but my kernel log (Linux Mint) shows no messages at all, so I can't access the device storage via adb or direct file system mount, as I used to be able to do.