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I have a late 2012 Mac Mini (High Sierra, 2.3 i5, 8GB) which just had the hard drive replaced. Did a restore from Time Machine and everything is working fine, except when the Mac goes to sleep I can't wake up the monitor without unplugging and replugging the HDMI cord. Once I do that it comes back on. I have tried multiple HDMI cords and all do the same. I changed the setting in Energy Preferences to 'Never' turn off and the monitor will stay on indefinitely no problem. If I change the setting to 1 Minute, the moment it turns off nothing will wake the monitor, except for unplugging the HDMI from Mac and then plugging it back in. I don't have another monitor to test on, and won't have a chance to take the Mac someplace to test for another week or so... Any help is appreciated...

Mac mini, Mac OS X (10.7.5)

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I bought the HP Pavilion 22cwa 21.5-inch IPS LED Backlit Monitor off of Amazon to use as a second monitor with my MacBook. However, when using an HDMI cable, there is a connection problem and both the Mac and the monitor flash black repeatedly trying and failing to connect. Eventually the monitor will connect but this could take 5 minutes one day and 20 minutes the next. A Dell laptop connects instantly though, so I suspect it's a problem with my MacBook.

I talked with HP and they said it might be a resolution issue. Has anyone had this problem and were able to fix it by changing some resolution settings? Or anyone have an idea of what I can try to fix the connection issue? Thanks in advance!

2 Answers

I agree with HP - an incompatible resolution could certainly cause this problem, although it could be something else.

The recommended resolution for the HP Pavilion 22cwa 21.5-inch IPS LED Backlit Monitor you purchased is 1920 x 1080 pixels, so you could certainly play around with your settings in Apple > System Preferences > Displays to see what impact they have.

The other thing you can check are the various settings on the monitor itself by pressing the Menu button to access the On-Screen Display (OSD). One option that I've seen help many users is changing the Input settings on their monitors, such as turning the automatic input setting off and manually selecting the input.

If all of the above fails, there are some troubleshooting steps you can try on your MBP.

Reset the NVRAM

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Older Macs had what's called Parameter RAM (PRAM), newer Macs use Non-Volatile Random-Access Memory (NVRAM). To reset this on your particular MBP, follow these steps:

1. Shut down your machine. Yes, a full shut down, not just logging out.
2. Press the power buttonand then press the commandoptionpr keys. You have to make sure you press these keys before the gray screen appears or it won’t work.
3. Hold those keys down until your Mac reboots again (i.e. you hear the startup chime a 2nd time).
4. Let go of the keys and let your Mac reboot normally.

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Note: When you log back in you may need to readjust some of your system preferences (e.g. speaker volume, screen resolution, startup disk selection, time zone information, etc).

Boot into Safe Mode

Follow these steps to boot your Mac into Safe Mode:

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1. Fully shut down your Mac
2. Restart your Mac
3. Immediately press the Shift key and keep it down
4. Let go of the Shift key when you see the login window (NOTE: If you have FileVault enabled you may need to log in twice).
5. Take a note of what happens (i.e. can you connect to the monitor okay, etc)
6. Restart your Mac as normal to exit Safe Mode
7. Test again to see what happens

Once you've booted into Safe Mode, let me know how you went and we'll go from there.

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I have same monitor and 2017 monitor. Just cycled the monitor power and poof.. it worked.

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