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User profile for user: messerchtmitt
messerchtmitt Author
User level: Level 1
13 points

MacBook Pro Mid 2012 Flickers, Kernel Panic, CPU Panic, and Beep Thrice

After I upgraded my MacBook Pro to Catalina 10.15.5, it started to crashed from time to time and screen flickers. I shutdown my MacBook Pro and perform the resetting SMC and MVRAM / PRAM, when I turn it on sometimes it beeps 3 times and so on (Probably RAM issues). I open the MacBook Pro and removed the RAM and returned it to its slots, and it runs successfully. Later, after a few hours of use, the screen flickers and hang up. Sometimes it returns an error mostly, Kernel panic or CPU panic.


Every time all those issues occurs, I just removed the RAM and put it back again to its slot, and it will work fine, then later the screen flickers or the system crash. I checked its hardware problem through built-in diagnostic (Command + D) at start-up and find no issues.


It will run smoothly and no issues when I boot it on Safe Mode. Maybe the MacOS I installed is not fully supported with my Mid 2012 MacBook Pro or maybe something is wrong with the MacOS.


Somebody in here would like to help, suggest, and or recommend the possible fix of the above MacBook issues. Going to Apple support is quite expensive.

MacBook Pro 13″, macOS 10.15

Posted on Jul 13, 2020 12:50 AM

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User profile for user: messerchtmitt
messerchtmitt Author
User level: Level 1
13 points

Posted on Jul 18, 2020 2:06 AM

I have solved the problem of my MacBook Pro 13" Mid 2012 screen flickers, kernel panic/CPU panic, 3 times beep at start up, and crashing.


There's a problem with the logic board in the RAM sockets especially on the second slot. If you apply pressure or any movement underneath, issues occurs as mentioned. I say, 2nd RAM slot may loss connection especially when added another RAM on top and may cause beeps, screen flickers, and sometimes system crash.


SOLUTION: I took off the 2nd RAM on the last slot and placed the other RAM at the top socket with only one RAM inserted. My MacBook runs smoothly again with no more issues.

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User profile for user: messerchtmitt
messerchtmitt Author
User level: Level 1
13 points

Jul 18, 2020 2:06 AM in response to messerchtmitt

I have solved the problem of my MacBook Pro 13" Mid 2012 screen flickers, kernel panic/CPU panic, 3 times beep at start up, and crashing.


There's a problem with the logic board in the RAM sockets especially on the second slot. If you apply pressure or any movement underneath, issues occurs as mentioned. I say, 2nd RAM slot may loss connection especially when added another RAM on top and may cause beeps, screen flickers, and sometimes system crash.


SOLUTION: I took off the 2nd RAM on the last slot and placed the other RAM at the top socket with only one RAM inserted. My MacBook runs smoothly again with no more issues.

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MacBook Pro Mid 2012 Flickers, Kernel Panic, CPU Panic, and Beep Thrice

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