Hooked up HDMI cable from receiver to tv, no sound coming out of speakers, am/fm works through speakers fine, is there something I need to do with my tv to make it work, and does it matter which HDMI port I use on the tv?

Hook your cable box hdmi out to the receiver, then out of the receiver to the tv.

MAke sure your channel selection is correct.

connect the hdmi to the tv (hdmi input 1) and to the receiver (hdmi output) you must make sure that the receiver input settings are assigned correctly. Then hook up all of your devices to the receiver. remember that the 1508 dosent do hdmi upconversion, so if you have any devices that are NOT hdmi, you need to run rca cables from the output of you receiver to the input of your tv. If you have any digital inputs coming out of your devices, i would recommend using them. your 1508 has two inputs that are assignable.
If all of your devices are hooked up to your receiver, and its hooked up to your tv properly, just turn down the sound on your tv, and turn up the volume on your denon!

BD and DVR hooked up to the receiver and from the receiver to the TV right? If yes: Your receiver set to pass sound trough to the TV, if you want sound from the home theater setting has to be changed.

Connect Xbox via HDMI to DTV/IN, Connect HDMI from out to Sony Bavia's HDMI/IN. Connect TV's Optical out to amps DTV/Optical in.

2X HDMI cables and one Optical are required.

Enjoy great sound :)

OH: choose the DTV input then stereo and then dolby 5.1 etc .. cheers

I recently got the same receiver and had the same problem. Here's what I was told - and it worked for me:

Even though HDMI cables carry audio and video, for whatever reason this reciever won't accept audio through hdmi. Apparently only much more expensive recievers carry audio through hdmi. What you have to do is run optical audio cables from your xbox, cable box, dvd player or other video device to the optical inputs on the back of the reciver. Then you customize the scene buttons to match your video and audio inputs.

You can get these optical cables pretty cheap on line or even at target. Don't get ripped off by Best Buy for these cables. I love best buy, but they rip off on cables!

This receiver is great - once I got it all figured out and running right I've loved it! Hope everything works out for you!

you should be able to disconnect the analog audio cables from the cable box and Denon, with the HDMI connected, press the input mode button on the front left of the reciever to select auto and that should fix the issue

Do you have set-top-box or antenna-cable directly to TV?
You have connected TV with received via HDMI, but that won't work in this direction - TV has HDMI INput only, not output.
You can use HDMI to connect HDMI-out on DVD player for example to HDMI-in on receiver and HDMI-out of receiver to HDMI-in on TV.
But to get sound from TV to the receiver, use spdif optical or coax cable if TV supports that - this way you will get surround sound.
But also your connection via analog white/red RCA plugs should work, but only for stereo sound.

Hook up Composite / Component Monitor Out wire from receiver to TV video input because receiver will not change analog input into HDMI
You need to connect receiver and TV through analog video terminals as above.
Actually you are expecting that receiver will convert DVD player and Xbox analog video input into digital HDMI signal for TV and This is incorrect.

How do you have the audio hooked up from the TV set? If its s video or RCA plugs? If it is switch them around and see if it swaps channels that goes out . If it does then the output cable or the jack is bad. If your using an HDMI ir a scart cable. The cable or connections could be bad. Unplug it and reinsert it or while the units on mover it around and see if the audio comes back on.