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If you're saying the set's native MENU (using the original Hitachi remote) does not come up, then this typically indicates a premature failure of the set's LED power supply- which is what drives the lighting built into the screen.
However it's worth it to try a hard reset, as sometimes the processor in the TV can simply have locked up.
The first thing you would try, is disconnect the set from power, then press and hold the power button on the TV itself (not the remote), for 10 seconds and release. Then plug the set back in, and also check that the power cord is connected tight at the TV as well. Press power once, and see if the set powers up normally. Try this procedure up to 2 times, and please let me know what happens.
Are you still having the same problem?
If the screen is still COMPLETELY black (meaning MENU's, or any off the TV's other native functions won't display) then this unfortunately does indicate a premature hardware failure in the set that would require warranty repairs- more specifically either replacement of the power supply/LED board, or the LED's within the panel itself. In that case you would want to contact Hitachi directly to start a warranty repair ticket on the set.
Other than that, I'm sorry for the bad news and wish there were a quick fix.
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