Before proceeding with troubleshooting multi-monitor issues, please verify that the multiple monitors are set-up correctly by following the guide in the following article:
No signal issues are usually identified by examining the power button LED (for most monitors, this will be amber in color if there is an issue) or by seeing a "No signal" alert on the screen. These steps may help identify whether there is a problem with your monitor or with the configuration of your multiple monitor setup.
- Check your power and signal cables for any damage. The connections for your cables should be free of any damage (for example, bent or sheared pins). If you are able, try swapping cables with those from a known working monitor setup. If the fault follows the suspect cable then the cable is at fault but if it stays with your multiple monitor configuration then the cable is free of problems.
Check to see if an adapter is being used. Adapters are used to change or pass through the signal from one standard to another (for example, a DVI to VGA adapter). If possible, try to remove the adapter and connect the cable only to the monitor and system. If an adapter must be used, try using another adapter from a known working monitor setup. Again, you will be able to verify if the adapter is the root cause if the fault follows the adapter or not.
Re-setting the monitor defaults may resolve any no signal problems. The procedure for doing this varies between monitor models so please see your monitor's manual for further instructions.
Try connecting the suspect monitors individually to another known working system. If the monitors function correctly when attached to another system, it proves that the monitor has no hardware issues.
You may find that you can get a display on a single monitor, however, you may have issues having a display on 2 or more monitors. These steps outline the basics when attempting to resolve this problem:
First, rule out a hardware problem with each monitor that will not display by going through the steps from the No Signal to Monitor section above
Swapping monitor connections if possible (for example, connecting a VGA cable to your monitor rather than a DVI cable) may highlight that the issue exists when using a specific output.
Connecting the monitor to a different video card port in your system if possible also helps to rule out or confirm that the problem is with the system's video connections.
Make sure that your system or video card is capable of multiple monitor displays. This involves researching your system or video card specifications to ensure that the system or video card is able to run a multiple monitor configuration.
Ensure that the multiple monitors are detected in your operating system. For Microsoft Windows systems, use the links above in Section 1:
If all multiple monitors are detected by your operating system, you may have to enter the video card manufacturer's control panel and enable the multiple monitor configuration there. To do this, please visit your video card manufacturer for information on their control panels.
Updating your video drivers may resolve the issue that you are experiencing.
Keeping the drivers updated for your graphics card/chip and processor ensures that you always get the best performance from your gaming computer. Click the appropriate links below to download the latest drivers:
- For Intel drivers, visit the Intel Drivers and Software page.
- For computers with NVIDIA GeForce graphics, visit the GeForce Driver Download page.
- For computers with AMD Radeon graphics, visit the AMD Support and Radeon Software page.
Article Version DK.01