questionsanyone got a roku 2 hd? what about with a vizio…

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The Roku is probably updating it's firmware. I've got a Vizio VBR122 and a 42" Vizio TV and went through the same thing for the first 4 or 5 hours of the BluRay being connected to the internet.

Best just to leave the box up and running for a while to do it's thing.

The only other issue could be bandwidth.

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The Roku 2 HD is capable of 720p(not 1080p) so you should be fine. Like @matt1976 said the firmware update process can take a while to complete, especially if you interrupt it by hard resetting it...

I have the Roku 2 XS on a Visio TV, you wanna make sure you disable any of the Visio features. I can't remember what it is called off the top of my head but my Visio TV has some kind of feature where it can control devices over HDMI such as detect/adjust resolution or power devices on/off. You want to make sure you turn that off.

If after leaving the Roku hooked up to the TV and internet over night and you are still having issues sounds like it is time to return the unit.

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I don't think it is in the midst of a firmware update because it claims it is at the latest firmware when you check it in the settings screen.

Also, it seems to work fine using the composite video cables and HDMI cables, but only when it is set for 4:3 or 16:9. The black screen only happens when 720P is selected with an HDMI cable (it isn't possible to select 720P when using the composite cable).

As for bandwidth, she has FIOS so there is plenty of bandwidth from her router to the internet. Her WiFi is not heavily used and the Roku shows the signal strength as excellent. Thus, I don't think it is a bandwidth problem. (Also, it works fine using composite cables, or 16:9 with HDMI.)

My concern here is that the thing isn't working the way it is supposed to, especially since I have no experience with them.

However, it sounds like this might be defective (or at least not working the way it should), so I'm thinking it is time to contact Roku's tech support. :(

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I wish I could understand everything above my comment...maybe someday. :)