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This is a tricky problem to trouble shoot, you will need a professional with additional test equipment to handle this, but since it is coming from both channels it suggest the source of the problem is in the power supply.
The chances are that you have selected an incorrect sound setting or not switched it on, for the HDMI you are using. With Onkyo receivers each connection will have it own settings for video and sound. You just need to look in the manual as to how to select the settings.
Are you not getting audio to the television speakers and the onkyo reciever speakers when connected HDMI thru the reciever or just the television. If it is just thru the television then it is because the reciever is grabbing the HDMI audio signal and converting it so it does not reach the TV. If it is both then try changing the HDMI signal output from PCM to DOLBY DIGITAL on the computer. Your reciever may not be able to process the PCM signal of the computer. Does the reciever show a PCM or DOBLY DIGITAL display when HDMI is hooked up to it?
Does it only happen when its being stressed (played really loud)? Is it hot? If so, is it well ventilated and away from other heat sources?
Somewhere in here is the answer.
"The AV receiver turns off as soon as it’s turned
on
• The amp protection circuit has been activated.
Remove the power cord from the wall outlet immediately.
Disconnect all speaker cables and input sources,
and leave the AV receiver with its power cord disconnected
for 1 hour. After that, reconnect the power cord
and set the volume to maximum. If the AV receiver
stays on, set the volume to minimum, disconnect the
power cord, and reconnect your speakers and input
sources. If the AV receiver turns off when you set the
volume to maximum, disconnect the power cord, and
contact your Onkyo dealer."
That last sentence is misleading. I don't think they actually want you to play an active signal at MAXimum as a test. I think they mean with all sources attached and an idle one selected, like CD, crank the volume knob. If the amp is not in Protection mode you should always be able to detect some hiss up close.
For another thing, if it shuts down only with speakers attached the problem could be outbound at one or more of the speakers. I would isolate that piece somewhat before throwing my hands up and calling Onkyo. Make sure that the speaker cables are not shorting. Disconnect certain speakers and try it again until you figure out which one(s) are involved. Then it could be the speakers.
Unfortunately only the higher end Onkyo Reciever pass audio over HDMI for sound. 605,705,805,905 exc. Your reciever will carry Video over HDMI but you will need a digital optical cable for sound.
HI,in the speaker set up menu on your amp there should be a 6ohm setting but if not don,t worry as it won,t cause any problems.You will have to set the levels for your speakers so they match each other to keep sound right.
Try to see if the reciever will make the buzzing/noise without anything connected to it except power, and speakers. Tune into a local radio station and see if the noise continues. If the noise has stopped, then you know there is an issue with the player or cable.
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