The following specs apply to this screen:

Product Size (W x H x D) Without Stand 58.4" x 34.4" x 3.8"
Product Size (W x H x D) With Stand 58.4" x 36.5" x 13.0"

The screen size is measured diagonally.

Thanks for your interest in Samsung products.

--Mr.Samsung

We can't answer this, since neither model is listed as the product.

Some cables have a higher speed rating, and some cables also have networking options.

This television, however, will work with either HDMI cable.

--Mr.Samsung

This would be better answered by the retailer, or by your tax preparer or tax expert.

We appreciate your interest in Samsung televisions.

--Mr.Samsung

Do any other inputs - such as a DVD or Blu-Ray player - work? If you aren't sure, try checking to see if audio comes from those ports - that information may be useful if a technician is necessary.

You might try:

1. Resetting (or unplugging and plugging in) your DirecTV box - just to refresh it and make sure the box isn't the issue.
2. Check your cables - both at the TV and the Cable box.

If that doesn't help, you may try calling the Best Buy Geek Squad for further assistance. It's likely that your set is still covered by warranty, and if you need a repair, you may be able to get that scheduled.

Thanks for your support of Samsung televisions.

--Mr.Samsung