No Input Signal error message
No Input Signal error message.
Tip: This document is for troubleshooting the no input signal message when connecting a monitor to a computer. If this is a laptop see our steps on connecting a monitor to a laptop.
Monitor not connected properly
Verify that the monitor is properly connected in the back of the monitor as well as to the back of the computer. The monitor data cable will connect to the back of your computer using either a VGA connector or DVI connector usually.
If the monitor appears to be connected properly, verify that a cable is not loose by disconnecting all cables that can be disconnected in the back of the monitor (the data cable cannot be disconnected). Next, disconnect the data cable connected to the back of the computer and then reconnect the cable. When connecting the cable in the back of the computer ensure the cable connection is tight. Most Computers will also have screw ends that can be screwed in to hold the connector in place.
Tip: Some computers may have an onboard video as well as an expansion video card. When working with this type of computer, you'll have two different connections for your monitor on the back of your computer. If you see more than one VGA or DVI connector and the monitor is not working try the other connector.
If the connections appear to be correct, either the monitor or the computer video card is bad. To test what component is bad either connect a different monitor to your computer or connect your monitor to a different computer.
- If another monitor works on your computer, the monitor is bad.
- If your monitor works on another computer, your video card is bad. Troubleshoot the bad video card to determine if it is the video card.
Tip: If you believe your video card is bad and your computer has onboard video, the motherboard will need to be replaced.