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HI there, sorry to hear you're having trouble with the yamaha,
are you saying that it won't play audio via hdmi inputs, or output (pass through) hdmi video to the tv?
If so, and if you're on the proper input mode (you'll see hdmi displayed on the front of the amp), then this is most likely a failed hdmi board. I've actually seen this issue several times with this particular model, it can be a manufacturer defect (bad chip or ic) but is also often caused by damage from a power surge or static shock through hdmi when connecting/disconnecting components.
Assuming this is the case, which you can confirm by doing a factory reset of the unit:
go into the advanced setup menu by turning receiver off, then press/hold the Straight and Power buttons (on front of receiver, not remote), until Advanced Setup shows on the display.
press the Program button to cycle through the menu until you get to INIT, then press Straight until you get to ALL, then power the receiver off, and back on. This will clear any stray settings back to factory defaults, and reset the microprocessor.
If the problem continues after this, then the hdmi board is faulty. That is something that would require repairs to correct. Assuming you are within the 2 year warranty, yamaha should cover repairs for you.
If you are beyond the warranty, bought it used or from a non authorized retailer, or just don't want to deal with warranty repairs (meaning you'd be without the receiver for 3-6 weeks while it is in the shop),
the next best option, other than replacing the receiver with a new model, would be a workaround connection. The best alternative to the hdmi connections would be to connect all of your source devices (cable/sat, dvd, game, etc) directly to the tv via hdmi. Then run a single optical cable out from the Digital Audio Out port on the back of the tv, to the optical input on the yamaha. Set it to optical input mode, and all sound will play through the yamaha. Note that you'll want to disable the tv's internal speakers when you do this, so they don't conflict or echo.