As a quick reminder, M1 Macs can’t handle two external monitors. If you own an M1 MacBook, consider buying a multiport adapter that’s compatible with your current configuration. Restart your Mac, connect your monitor and check if you’re still getting “No Signal” alerts. Then, enter Safe Mode on your Mac, and go to /Library/Preferences.ĭelete all the files that contain. Unplug all the connectors, and restore your smart monitor to factory settings. Delete All WindowServer Files in Safe Mode Unfortunately, if your monitor only supports DisplayPort 1.1 and 1.2, switching between those may not make a difference.

If downgrading to DisplayPort 1.2 doesn’t fix the problem, go back to version 1.4 and check if you notice any changes. However, setting the DisplayPort version back to 1.4 fixed the glitch for some users. Switching to DisplayPort 1.2 should fix the problem. Most likely, Monterey is messing up protocol negotiation. This should allow your monitor to capture signal output from your Mac.Īs many users noticed, this issue often affects devices configured for Display Port Protocol v1.4. Then disconnect and reconnect the cable from your Mac to reset the connection. Go to monitor settings and switch to DisplayPort 1.2. Try lowering your DisplayPort version from 1.4 to 1.2, and check if you notice any changes. Use a different cable and check if the alert disappears. Then, plug your monitor back in, connect it to your Mac and check if the “No Signal” alert is still there.Īdditionally, check your cable and make sure it’s not frayed or faulty.

Wait for two minutes to get rid of flea power. You need to unplug your monitor’s power cable, don’t just power cycle it using the On/Off button.

Remove the USB-C or HMDI cable and unplug your monitor.

Delete All WindowServer Files in Safe Modeįix “No Signal” Alert After Upgrading to macOS Monterey Unplug Your Monitorĭisconnect your external monitor and check if resetting the connection solves the problem.

Fix “No Signal” Alert After Upgrading to macOS Monterey.

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