why does my computer say no input signal

If your computer monitor is displaying the error message "No Input Signal," follow the steps in the sections below. This document is for troubleshooting the "no input signal" message when connecting a monitor to a desktop computer. If you are using a laptop, see our. To connect to a TV, see our page on. Make sure the computer has power. If the computer has turned off, it will not be transmitting a signal and cause the
"no input signal" message. Verify that the monitor is properly connected in the back of the, as well as to the back of the computer. The monitor data cable will connect to the back of your computer using either a
or usually. The pictures below are an example of a VGA cable and the connector on the. If the monitor appears to be connected properly, verify the monitor cable is not loose by disconnecting the cable from the back of the monitor and then reconnect the cable. It's also a good idea to rock the cable back and forth to make sure it's not just loose.

When disconnecting the cable, make sure none of the cable's are bent by examining the end of the cable. If any of the cable's pins are bent or broken, the cable may be defective. It is usually best to replace the cable in this case. Next, disconnect the monitor cable from the back of the computer and then reconnect the cable. When connecting the cable to the computer, ensure the cable connection is tight. With a VGA style connector, like the one shown above, this cable has screws that can be tightened to hold the connector in place. Some computers may have 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 or the 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. to determine if it is the video card. If you believe your video card is bad and your computer has onboard video, the needs to be replaced. You could also instead of replacing the motherboard. Verify your computer is getting past the process and that it is starting up. The No input signal message can sometimes appear if the POST process if failing and the computer cannot start up. If the POST process is failing and the computer is not starting up, it is possible the motherboard could be at fault. A short in the motherboard or a bad capacitor are common causes for a computer motherboard to not pass the POST process.

When the no-input signal error message appears on your monitor, take a few factors into account, each with varying levels of computer skill required for the resolution. As with all computer problems, turn off both the monitor and the computer for 60 seconds, then restart the system before beginning in-depth troubleshooting. When a computer is in power-save, or hibernation mode, it stops sending a signal to the monitor. Resume functionality by pressing a key on your keyboard or by pushing the power button, or by moving the mouse. After you ensure that the computer is sending video to the monitor, verify that the monitor cable is secure and tight at both ends of the cable. If it s secure, remove the cable and verify that there are no bent or missing pins in either end. If possible, use an alternative monitor cable that you know works. Though cable failure is rare, sometimes they can short out or otherwise become faulty.

The on-board video connector could have separated from the motherboard. If this is the case, the signal from the computer is not being processed. Connect a known working monitor, if you have one, to your computer to verify whether the message still appears. If the video returns, you will need to purchase a replacement monitor. If you continue to receive the error message after installing a known working monitor, the problem is likely your computer s graphics processor. Depending on your computer, the processor is either be a part of the motherboard or a separately installed piece. If this is the component that has gone bad, you will need to replace the graphics processor with a new one. Make sure that the new processor you purchase is compatible with your system and, if necessary, have it professionally installed to avoid further problems.

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