HDMI cables are best for computers with HDMI capabilities.
No, but the HDMI cable also carries AUDIO.
There are essentially two ways to get surround sound out of the Xbox. Via HDMI or via optical (TOSLINK) out. If you have the component video cable, then the end that attaches to the Xbox has an optical out port. Simply attach this to the optical in on your home theatre receiver with an optical cable. If you want to use audio via HDMI, in order to get surround sound you'll have to have an HDMI receiver capable of receiving audio. In this case run the Xbox via HDMI to the receiver and then the receiver via HDMI to the TV. The HDMI will send both audio and video. If you have the official Xbox HDMI cable you can also connect the HDMI cable directly to the TV and use the optical out connector that it comes with instead.
HDMI cables carry both video and audio. You only need one.
An HDMI port, and a HDMI cable are required for a Roku player for both audio and visual. The audio cable should come with the Roku player itself, and if it does not, it can be purchased online from a variety of retailers.
HDMI (High Definition Multimedia Interface) cables carry digital video and Dolby Digital audio data streams.
This is not an HDMI cable. Its for Playstation only. HDMI to DVI would be a cable, but does not support audio. We do not have a way to tap the audio off of an HDMI port.
HDMI cables contain both the video and the audio signal, so you just plug it in and it should work.
no the HDMI cable provides for both audio and HD video
Both DisplayPort and HDMI cables carry video and sound, so yes.
DVI cables and HDMI carry the same video quality, HDMI however can pass audio.
HDMI cables provide the best quality video and audio since there is no analog to digital conversion. They are also easy to use because you only need one cable as to using multiple cables. For more information on HDMI cables, try http://www.hdmi.org/learningcenter/faq.aspx