I had the same issue recently. Try holding the power button down when it is off until you hear two beeps, and see if you can redetect the HDMI cord. But if it still shows up blank on the HDMI channel, you may have to do a full system restore, which will sadly wipe out all your game saves and erase downloaded titles. (you can redownload them, though) It worked for me, but you may want to call Sony customer service first, I could have very well missed a solution less drastic than what I did.
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