Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved. Thunderbolt ports and displays: Frequently asked questions (FAQ).Apple Mini DisplayPort adapters: Frequently asked questions (FAQ).About Mini DisplayPort to HDMI adapters.Refer to these articles to assist you with adapter compatibility and further configuration information: Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display.It is always good to have your notebook connected to AC power when an external display is in use. If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure.When using an external display be sure to check the following: I would recommend you perform the steps in the following article to help troubleshoot or isolate the issue:Īpple computers: Troubleshooting issues with video on internal or external displays It sounds like you are seeing some odd graphical issues periodically on your computer.
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