Display did not change at all


Last night I put power cable on MAX2, turned it off, and slept.
Next morning I found that the device did not work.
The display does not change at all.
(it stopped in the middle of booting process.)

I tried several methods, pressing power button for 10 seconds,
pressing power button and U-arrow button simultaneous for 4~10 seconds or more.
None of them works.
The display does not change at all.

What can I do?


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