When mac wakes up, my display picture is broken, falling apart

Experienced users on these forums frown on using Sleep, why because it often causes problems similar to what you are experiencing. In order to get the same net effect please do the following.

1. System Settings (You can find this by clicking the Apple symbol in the upper left of the display)
2. Lock Screen (located on left side of the sidebar)
3. Set "Display off when inactive" to the amount of time you desire. I have mine set for 3 minutes and that has worked for over 20 years!

+1 @rkaufmann, adding:

Sleep is unnecessary on later Macs and should be disabled. Shut for long absences/idle overnights i.e and for regular operation, use the settings exactly as shown below:

Also, do not manual-sleep for brief absences, use instead the Lock Screen settings to switch the display off on timer (value as per your choice):

Wow, that is REALLY REALLY bad. Mac OS does not require nor does it benefit in ANY way by having third party:

• Antivirus
• Cleaning
• VPN
• Security
• Maintenance

apps installed. My strong recommendation is to locate the uninstall install instructions for:

• Bitdefender
• Nord VPN

and uninstall. Then download and run FindAnyFile and having it search for anything with those names and have it Trash those files then empty the Trash!! You may also consider getting rid of Chrome too.

All that Mac OS needs in order to stay secure is to keep it up up-to-date and restart the computer about 1x per week. Other than that PLEASE leave it alone.!!!!!!!!!!!!!!!!!

I think once you do that and get your setting set correctly your Mac will run just fine.

What I meant is you can set the amount of time that you prefer. If you prefer 20 minutes, that is fine. I was only mentioning that I have mine set for 3 minutes which is my preference. What your preference is, is totally up to you.

Of course once you do this turn the Sleep function that you have been using off so there is no conflict as hcsitas explains.

It may not necessarily be the display itself!

Do you have any of the following third party apps installed on your Mac?

       •      Antivirus Apps

       •      Cleaning Apps

       •      Security Apps

       •      VPN Apps

       •      Maintenance Apps

Rdkee wrote:

If I detach and reattach HDMI cable to the Mac, it solves the problem.

Nothing happens if I detach and reattach HDMI cable on the monitor's side.

Get and test a short (1meter) high speed 2.0 HDMI cable.

for example: https://www.amazon.com/8K-HDMI-Cable-Highwings-Braided/dp/B08NX5CZTF/ref=sr_1_3?

"Well that is 100% false information. VPN not only is unnecessary for

most users, installing cheap VPN's like Nord can cause damage to Mac OS."

I don't even know where to start. You do realise VPN stands for virtual private network?

It’s related to the settings for Sleep - set exactly as shown.

The Mac Mini M1 had / has this problem. Seems it's not fixed four years later.

Workaround ≠ solution.

VPN is a personal user choice for (alleged) privacy and in 2024 has nothing to do with 'the computer doesn't need it'.

Well that is 100% false information. VPN not only is unnecessary for most users, installing cheap VPN's like Nord can cause damage to Mac OS.