Screen changes colors only
Hold the Vol+ Vol- buttons down and turn on the power switch in the back of the unit.
The screen should turn blue and some square in the middle of it.
The noisy square is actually the bios being reset.
Once the unit turns itself off, you can turn it back as usual.
Note: Some of these units require a 3 button reset.
In that case hold Vol+ Vol- and Menu at the same time while you turn the power switch on in the back of the set.
I hope it was helpful.
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