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i have harmon kardon speakers that came with my hp a815n, i recently had to reinstall my operating system, and i can't hear anything from my speakers. i've tried installing drivers and "searching for new hardware" and i can't seem to get it.........please help
if you are a tech from your explanation you could be having problem with your microchip in the standby power supply circuit to verify if it is your microchip bridge your relay if your tv comes on it is your chip if it does not, start checking the regulator in the power supply and associated components.make voltage checks in your horizontal circuit including your flyback transfomer probably there is problem in that section also if you cannot do it take the set to a tech to do the repairs.good luck.
I have this exact problem, it appears the power on/off switch no longer works. After re-setting by unplugging the unit, use the remote only. As for the display, I find that if I turn the home theatre on last, the unit works and if I turn it on first, it behaves as you described.