Question 1

This doesn't support video and sound like hdmi does it? if so that would be great.

Accepted Answer

I am pretty sure not.  I didn't end up using it.  
1) It broke after plugging it in the computer and then someone turned the computer in a tight space, cracking the case.

2)The other adaptor I bought was wired to add sound.

Question 2

Will this work to connect an xbox to a computer monitor?

Accepted Answer

depends on what the input is on computer monitor..if your monitor has DVI (white port) and VGA (blue port) then NO...if you have a display port capable monitor (which looks like a squared off HDMI) then yes

Question 3

will this work with a macbook?

Accepted Answer

No, actually you need a mini-displayport for any newer mac.  The newest macbook pro have the full size hdmi connector, but anything older will have mini-displayport, not this full size displayport.  Older than 3 years or so you need a mini dvi adapter

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