The key here is whether or not the unit clicks. When turned on, you should hear an initial clcik followed a short time later by another. I suspect that you are not hearing the second one. This indicates that the unit is in "protect" mode. Please see the link below for an explanation of protect mode. Feel free to post any additional questions here.
Thanks,
Dan
Link: http://www.fixya.com/support/r5390728-protector_means
Press MUTING to mute the sound through all
speakers and headphones connected.
"MUTING" appears on the display and the
volume turns off (the volume level indicator goes
off).
To restore the sound, press MUTING again so that "OFF" appears
on the display.
• Turning MASTER VOLUME on the front panel or pressing
VOLUME +/- on the remote control also restores the sound.
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