JVC car stereo wont turn on?

My JVC car stereo only turns on When i press the menu and power button at the same time, and it turns off when i let go. it says demo when its turned

My JVC car stereo only turns on When i press the menu and power button at the same time, and it turns off when i let go. it says demo when it's turned on.

or:My JVC car stereo only turns on When i press the menu and power button at the same time, and it turns off when i let go. it says demo when it's turned on.

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