Try switching off from mains and rebooting, also maybe try another HDMI cable as I've had the same problem and it was a faulty HDMI cable that came with box.
Try pressing the mouse button on/off. I've spent times trying to navigate and the controller was in mouse mode with the cursor jammed into one corner so I couldn't see it. Worth a shot. I take it the power button works on the controller to switch the unit on and off?
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