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It sounds like your TV is on the wrong input. Look for a button that says input or source. Depending on the TV this will either provide an onscreen menu to select an input or it will simply scroll through the inputs. Turn on the Sky box and run through the inputs until you see something that looks like your Sky Box.
You will have to access the service menu. From it, you can reduce the luminance of the red and green bands.
To enter the menu, press the menu button the TV panel and hold it down then press the menu button the remote simultaneously. In a few seconds, you will be prompted for a 4 digit password. The password is 0000. Enter it with the remote.
There are two menus that will alternate upon entering it with this method, which one comes up depends on the last time the service menu was entered if it ever was.
You can navigate the menu with the remote. Find the selections labeled for R G B. This stands for red, green and blue. There will be more than one input available for these selections, make sure you select the input that your ATT-U-verse is connected to by toggling through the menus.
Adjusting your red and green; After finding your proper input and your adjustments for RGB with that input, toggle down to the selections labeled as RGB gain. Reduce the numbered value by 2 or 3 points for R and G and press enter on the remote. Then press menu. This will return you to your input currently use, preferably the input you are adjusting. Using the same picture every time, such as a freeze frame picture that was not to your liking, repeat this process until you are satisfied. Keep in mind that all colors will interact together. If you find that after making the R and G adjustments together tends to make your red tones appear to be too muted or more of a purple hue, return to the service menu as I described above and reduce the B (blue).
Going by eye is quite inaccurate but however; for a picture that isn't far off from your preference changing these values by only few points in the Gain channel will not make any drastic differences.
For a more accurate picture for your input in question, I recommend a monitor calibration tool such as the Spyder 3 TV. You could alternatively use a DVD based software such as Avia, but that is for your DVD input...in that case you could simply use the settings from that calibration for your other inputs by manually copying them and that may work too. The Spyder is my best consumer based recommendation short of a professional calibration for your ATT U-verse input, the DVD is second but both are much much better than the naked eye.
This happened to me with my 5080 also. No amount of messing with the remote inputs/menus/controls would work. The menus and on screen info displayed, but would not display any input. Solution was to unplug the power cord (not turn off, UNPLUG), let it sit for a while, then plug it back in. It came right back. Apparently the onboard computer gets a little confused sometimes and removing its power source clears it out.
That is a problem with your main board - some of your inputs work fine and another is bogus. The tv input is not working because there could be a defect in your tuner. If you have cable try a different input for the signal.from the box. If you are using OTA, then use an external HD OTA tuner to feed your set.
How do you have your DVD player hooked up to your TV(i.e. composite, s-video, component)? Some DVD payers and TVs have menus to switch inputs and if you somehow switched off the input your players are connected to, you'll get a "no signal" message.
First try hitting the input button on your TV or the Input/connection option in your TV's menu.
If that doesn't work try hooking up the DVD player(s) with the composite Cable(yellow), the component(red,green,blue) and S-Video(black/round) at the same time. If you scroll through your TV's inputs you should get a picture on one of these connections and the TV should display which one. The display will usually be in the corner of the screen.
If it was a setting on the television, then the cable info would also be affected. Try a reset on your cable box, as the cable info is generated within the box from the data stream, whereas the picture is streamed from the provider.
If the reset doesn't work, it's time to call the cable company - it's not a fault with your telly.