I was having this issue this morning and called Nintendo support. The lady on the phone, who was very nice, ran me through some troubleshooting, which I had tried myself prior to phoning in, and none of it was successful. She began to suggest that it owl have to be shipped in for repairs when she asked if I was using the Nintendo HDMI cable, which I wasn't. I unplugged the random HDMI cable that was in use and attempted to turn the system on, sans HDMI. It turned on. The woman mentioned that the wii u requires a high speed cable and won't function without one. Funny that the system had been working with the cable before, not sure what prompted it to not work today. Anyway, if anyone does experience this issue, make sure you are only using Nintendo licensed peripherals as third party ones may cause problems.
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