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Let's treat this as TWO functions - audio and video.
Your best video would be HDMI output (audio & video) from the cable box and EACH other video source (BD/DVD) directly to your TV and receiver. But, I'd still WATCH the video from the direct TV connection. The fewer intervening cables and electronics, the better.
Your best audio performance will come directly from each multichannel source via a digital (HDMI, coaxial or optical) cable to the receiver. I would LISTEN to audio through the receiver for best quality.
See a trend here? TV's best at video; receiver is the master of audio.
And neither one adds much by handling the other. Usually the opposite.
You mention coax. Do you mean coaxial digital audio????? As coax is also shorthand for the thick black cable bringing video to most cable boxes, connecting antennae to TV's and such.
You don't actually define what the problem is. Only YOU can be the judge of what 'better' is.
There are a multitude of (mis)settings you should master before declaring a hardware problem. I'd dive into the manual.
Hum first,,, anytime you have 2 devices with sound running to a cable or ant equipted TV you will get a hum as they are grounded off curcuit. HumEliminator (radio shack). You didn't tell us if your PC had been enabled in control panel for either device. I have had no luck using the rear aduio output on any computer. Front headphone jack on PC does not need enabled and will work better for this. Unless you use a USC codet interface which is better yet for CD quality in sound. Also make sure the Aux inout is enabled on TV as well. Direct Input would be the same. Lastly,,you are 100% positive the backside is input and not actually out put or gaming inputs.
I will assume that your TV is an HDTV capable unit. Since I also would assume that the Denon AV1709 is properly setup in your listening room/Home Theater. You will need to purchase one HDMI cable from the Denon to the TV input. This cable must be long enough to go from the Denon to the TV with length to spare. The more money spent on a better quality HDMI cable will pay dividends on how much better the screen will appear. On the back of the Denon is an HDMI output labeled "Monitor Out" that the new cable will go into, and the other end of the cable will go into the TV input labeled HDMI. On the remote I would search for a button labeled "Input" or "Source" and on the screen I would look for the input that would reflect the same input you put the HDMI cable into in the TV. If your TV doesn't have HDMI inputs see if it does have "Component input" on the back The information will be similar but will reflect the different Input and Outputs you may need to use. The cables will be more complicated but they are color coded just for you. Red goes to Red, Blue goes to Blue, Green Goes to Green. Enjoy Re-Post if you need further information.