We have a flashing rounded rectangular box moving around on the screen which says input not supported. What does this mean? How do we fix it? this is happening on our Acer Monitor for our computer.

You'll need to cut the rectangular duct shorter and use the appropriate rectangular to round adapter.

Check your inputs. The no signal box means exactly that - there's no incoming signal for the TV to decode. So you've either disconnected a cable somewhere or turned off your input device.
Try changing the inputs on the TV (this will be a button saying input or A/V)
Try changing the channels
Check that your cables are correctly connected and that whatever you are trying to use (dvd player, PS3, etc) is turned on.
Check that your TV is tuned to the corresponding input it is plugged in to (if you plugged your DVD player into HDMI input 8, tune your TV to input 8)
Hope this helps.

This means, that your operating system is not set to the recommended resolution of your monitor. Your monitor has a "fixed" resolution where the image will look best. You can change the solution in Windows XP if you right-click on a free space of your desktop, then choose "Properties". In the new window, that comes up, select the rightmost tab. There you can use the slider to adjust your resolution. Just try some different resolutions until the message disappears. If you use Windows Vista oder Windows 7 you can access the resolution windows by right-cliking on your desktop and selecting "Screen resolution".

erm......reduce your graphic card output.

Try HDMI if the TV has the inputs or swap the component cable.

Start your Windows in Safe Mode (pressing F8) during boot process and adjust your Display Settings to a lower resolution.... say 1024 x 768. Once fixed, you can play around again increasing the resolution a notch at a time. Fix ya!

this means that your screen settings are not compatible with the game. like 16 bit color to 32 bit color. set the screen settings so that you can play. Display properties would let u adjust these colors.

using your remote ,off the close caption. the black rectangular box that you see for the message but since you have message in the box. that why you see a rectangular black screen.

NOT REALLY BUT YOU COULD GET ROUND IT BY BUYING A £20 DIGIBOX (FREEVIEW BOX) AND CONNECTING IT TO THE TV WITH SCART AND ARIEL GOES INTO THE DIGIBOX (FREEVIEW BOX).

MEANS YOU CANNOT WATCH ANALOG ON THE TV ANYMORE BUT DIGITAL IS MUCH BETTER.

the game will need to be set to the same screen resolution as your monitor or the best that suits, beccause of it being widescreen, so look in the graphic or video settings in the game, or change the resolution of your monitor to suit the games highest setting. This is done by right clicking on your desktop, down to properties and then the settings tab in the next window and then move the slider at the screen resolution box.