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Which of these methods helped you solve the problem? Did you find other ways to troubleshoot this issue? Feel free to share your ideas in the comments below. If the issue persists, use a multiport adapter and roll back to Big Sur. To sum up, if you’re experiencing “No Signal” output issues on macOS Monterey, unplug your external monitor and downgrade to DisplayPort version 1.2.

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For more information on how to reinstall macOS, go to Apple’s support page. I tried all suggested resolutions to the other post here (restarting dock etc) with no success. While the monitor is recognized by macOS, there is no picture (blank screen). The other monitor is connected via HDMI and is not working. One monitor is connected to the DisplayPort and works fine.

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If you did not experience similar issues on Big Sur, rolling back should help you get rid of the “No Signal” alert. I am using this dock with a 16 inch MacBook Pro and two Acer V277U monitors. Well, if nothing works and you can’t use a multiport adapter, consider downgrading to Big Sur.

Roll Back to Big Sur Access Recovery mode to reinstall macOS. So, if you’re getting a “No Signal” prompt when using a two-monitor configuration with your M1 MacBook, buy a Hyperdrive Dual HDMI Adapter to work your way around this limitation. 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.

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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. I showed above iPhone 2 are experiencing external display connection issues. Remove the USB-C or HMDI cable and unplug your monitor. caffeinate -m will stop the disk from going idle But.

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.

I can click and drag programs between my three displays. My mouse still “moves” through the monitor, even though I don’t see anything, and some program windows are “open” in monitor A (even though I can’t see anything). When I open up my Displays option, I still see Monitor A in the “Arrangement” tab.

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Is this a software or a hardware issue? Could there be a problem with the HDMI port on my computer? Also, it seems like my Mac still detects that something is connected. This worked, and my monitor was displaying things again, so I’m guessing that this means that the problem doesn’t have to do with the monitor or the HDMI cable itself.

I also connected Monitor A to my laptop through an HDMI to DisplayPort 2 adapter. I tried to reset the SMC the NVRAM/PRAM but neither techniques worked. I tried reconnecting the HDMI cable and using a different HDMI cable (that has been confirmed to work with another device). This setup has worked fine for a few months, however, I started to notice some display connection issues earlier today when I opened up my laptop. Monitor B connects through a VGA to DisplayPort 2 Adapter. Monitor A connects through HDMI (which connects to my laptop’s actual HDMI port). I usually connect my laptop to two external monitors. I had to adapt the setting on my Macbook to get it working but found easy. My MacBook Pro (Early 2015, 13 inch Retina) has been suffering from some issues lately. White Thunderbolt Mini DisplayPort to HDMI Cable Adapter for MacBook Pro Air.