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No power at all and powers from USB but not batteries aren't the same issue. If a bad cap kept it from powering up on batteries it would most likely also keep it from running from the USB cable. For no power from the battery packs, but works from the USB, check and see if L1 has been knocked off the board. There are enough decoupling caps on there that losing one here or there isn't going to hurt anything. You'll need to do some poking around in there to track that powers from USB then runs from batteries issue down, as that seems a bit odd. Does the Guide button work when powered from USB?