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For desktop computers: check that the computer is on. Make sure that the monitor is connected to the correct port on your computer. Some desktops have graphics ports on the motherboard and a separate video card. In that case, the motherboard port(s) will be disabled.
Try a different cable and make sure that both ends are secured properly. (If there are multiple input options on the computer and the monitor, try a different port. Sometimes, a port fails. There are adapters available for DVI to VGA or DVI to HDMI if you don't have extra inputs on the monitor.)
Try a new video card and check that your Power Supply is rated to power the entire system. (Some video cards will not work at all if the power supply does not provide enough power to the card. Some power supplies have multiple rails and can't give enough power even though the overall power is sufficient.) Unfortunately, if you have been using a video card, connecting the
If you are connecting the monitor to a laptop, make sure that the external video port is enabled. Some machines will have the port disabled to save power.
If this was the first time using the monitor, make sure that the computer was off when you connected the cable. Then turn on the monitor and select the appropriate input (if needed) before turning on the computer.
the HDMI port is for connecting video and sound to a home theatre / surround sound system. I understand that this monitor only has a VGA connector.
The sapphire ati radeon 5570 graphics card has the following ports on the back to connect to a display: DVI (white), VGA (blue) and DisplayPort (the thin slot in the middle). You can use an ordinary VGA cable to connect the card to your monitor.
Unfortunately you cannot connect this card directly to your monitor using the DisplayPort.
Will the monitor work on another computer? Will the computer work with a different monitor? Are you connecting the vga port to vga output on the video card or the dvi input to the dvi output on the card. You may need a video card with hdmi output.
Monitors mix the 3 "primary" colours, in various proportions, to produce all other colours.
Mix equal parts of all 3 colours, and you get WHITE.
Mix equal parts of only 2 colours, and you get YELLOW.
1. your computer's video-card is not sending the 3rd colour;
2. your video-cable between the computer and the monitor is broken, and is not transmitting the 3rd colour;
3. your video-cable is not TIGHTLY connected at each end;
4. the electronics inside the monitor that SHOULD be producing the 3rd colour have failed.
Try connecting the monitor to a different computer, with the same video-cable. If it works correctly, your video-card is the problem.
Try connecting the monitor with a different video-cable, to see if replacing the cable fixes the problem.
Try connecting the monitor to a different computer, with a different video-cable. If it still is incorrect, then the monitor needs repair/replacement.
Not sure If I am understanding this correctly, you are trying to connect a monitor to a monitor? I have never heard of that before. As far as I know you need a video card that has dual output to use dual monitors. I am not saying you can't do what I think you are saying but I never heard of that before. Also on a side note depending on the resolution and amount of colors your operating system is set on, you need a video card strong enough to drive both monitors.