• Is the power cord connected properly? Check the power cord connection and power supply.
• Is the cable connected correctly?
  • Connected using the D-sub cable: Check the DB-15 cable connection.
  • Connected using the DVI cable]: Check the DVI cable connection.
  • Connected using the HDMI cable: Check the HDMI cable connection.
  • Connected using the DP cable]: Check the DP cable connection.

* DVI/HDMI/DP input is not available on every model.

• If the power is on, reboot the computer to see the initial screen (the login screen), which can be seen. If the initial screen (the login screen) appears, boot the computer in the applicable mode (the safe mode for Windows 7/8/10) and then change the frequency of the video card. (Refer to the Setting the Optimal Resolution] If the initial screen (the login screen) does not appear, contact the Service Center or your dealer.
• Can you see "Input Not Supported" on the screen?

You can see this message when the signal from the video card exceeds the maximum resolution and frequency that the monitor can handle properly. Adjust the maximum resolution and frequency that the monitor can handle properly.

• Make sure the AOC Monitor Drivers are installed.

Adjust the Contrast and Brightness Controls. Press to auto adjust. Make sure you are not using an extension cable or switch box. We recommend plugging the monitor directly to the video card output connector on the back.

Move electrical devices that may cause electrical interference as far away from the monitor as possible. Use the maximum refresh rate your monitor is capable of at the resolution.

The Computer Power Switch should be in the ON position. The Computer Video Card should be snugly fitted in its slot. Make sure the monitor's video cable is properly connected to the computer. Inspect the monitor's video cable and make sure no pin is bent. Make sure your computer is operational by hitting the CAPS LOCK key on the keyboard while observing the CAPS LOCK LED. The LED should either turn ON or OFF after hitting the CAPS LOCK key.

• Clean the button/key with compressed air.
• Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch or something similar.
• Unpair/repair or disconnect/reconnect hardware.
• Upgrade firmware if available.
• Windows only — try a different USB port. If it makes a difference, try updating the motherboard USB chipset driver.
• Try on a different computer. Windows only — if it works on a different computer, then the issue might be related to a USB chipset driver.
• Replace with new batteries (wireless product with dry batteries]
• Pointing devices only: If you’re not sure if the problem is a hardware or software issue, try switching the buttons in the settings (left click becomes right click and right click becomes left click). If the problem moves to the new button it is a software setting or application issue and hardware troubleshooting cannot resolve it. If the problem stays with the same button it is a hardware issue.
• If a single-click always double-clicks, check the settings (Windows mouse settings) to verify if the button is set to Single Click is Double Click. NOTE: If buttons or keys respond incorrectly in a particular program, verify if the problem is specific to the software by testing in other programs.

Check whether you are using the mouse on any reflective, transparent or uneven surface, if yes, not to use the mouse on these operating environments.

• Try to replace with a new battery.
• Check the setting to verify if the DPI is set at a proper value.
• Check whether it is connection issue.
• Try on a different computer. If your cursor does not move or the buttons or keys don’t work:
  • follow the synchronization method mentioned in the manual of the receiver you buy;
  • contact with local service center to get the synchronization method.

If you have wired devices follow the next steps:

1. Plug the device into a different USB port on your computer. If possible, don't use a USB hub or other similar device. If using a different USB port works, try updating the motherboard USB chipset driver.
2. Windows only — Disable USB Selective Suspend:
   • Click Start > Control Panel > Hardware and Sound > Power Options > Change Plan Settings > Change Advanced Power Settings > USB Settings > USB Selective Suspend Setting.
   • Change both settings to Disabled.
3. Update firmware if available.
4. Try testing the device on a different computer. If you have wireless devices follow the next steps:
   • Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch or something similar.
   • Move the device closer to the USB receiver. If your receiver is in the back of your computer, it may help to relocate the receiver to a front port. In some cases, the receiver signal gets blocked by the computer case, causing a delay.
   • Keep other electrical wireless devices away from the USB receiver to avoid interference.
   • Unpair/repair or disconnect/reconnect hardware:
   • Update the firmware for your device if available.
   • Windows only — check if there are any Windows updates running in the background that may cause the delay.
   • Mac only — check if there are any background updates that may cause the delay.
   • Try on a different computer.

1. Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch or something similar.
2. Move the keyboard closer to the USB receiver. If your receiver is in the back of your computer, it may help to relocate the receiver to a front port. In some cases, the receiver signal gets blocked by the computer case, causing a delay.
3. Keep other electrical wireless devices away from the USB receiver to avoid interferences.
4. Unpair/repair or disconnect/reconnect hardware.
5. Upgrade the firmware for your device if available.
6. Windows only — check if there are any Windows updates running in the background that may cause the delay.
7. Mac only — check if there are any background updates that may cause the delay. Try on a different computer.