I have MacBook Pro M4 A3112.(Nov'24). this is my first Macbook.

Initially display screen had some damage, so got the screen replaced and i notice both Wifi and Bluetooth has stopped working.

I took back to the repair guy who helped to replace the screen, but he has no clue why Wifi and Bluetooth are not working.

please find the attached the screenshots and photos I took as part of initial diagnosis I could do.

Please advise, what could be the issue and how to resolve this ?

Thanks

RB

Hi @danj

I did reformat whole Macbook and reinstalled OS. Seems issue still persists.

I connected the MacBook to my router using Rj45 cable with the help of connector so I can access wired network connection to internet.

However I tried to do offline diagnostic and I got the error CNW001 . Have attached screenshot.

Power charger wasn't connected to macbook when I ran the diagnostic so the error PPP020 can be ignored in the image here, as I see the MacBook is working fine when charger is connected.

Let me know what option i have to resolve this CNW001 error.

I am using wired connection for Internet for now, not a substantial solution.

Thanks

RB

I used an Ethernet cable and was able to connect to internet.

The pic was taken with ethernet cable on !

⟐ Answered April 10, 2026 at 23:09 MST

⟐ Commented April 07, 2026 at 19:53 MST

Issue video on youtube (don't forget not everytime randomly and less than 250ms): https://youtube.com/shorts/EHbUNVcB7Dg?s...

On macOS 26.2-26.3 and 26.3.1 (Apple Silicon M2 Pro), I am experiencing a very brief (1-frame) UI compositing glitch on the internal display. The issue occurs within a very brief time window (less than 250 ms), but it is extremely disruptive and visually distracting.

- Not thermal or load-related (tested under sustained high load)

- Installing third-party display scaling tools (e.g., BetterDisplay) reduces the frequency but does not eliminate the issue. (BetterDisplay installed on 26.3 but issue was also consistent at 26.2)

- A clean installation performed according to Apple’s official guidelines did not resolve the issue.

Behavior:

- The glitch appears as a brief (single-frame) layer misalignment or compositing artifact.

- It occurs even during light usage such as web browsing.

- It is particularly noticeable and disruptive while using code editors (UI instability is visually distracting).

Frequency:

- The issue repeats continuously.

- Sometimes it happens very frequently.

- Other times it occurs randomly every few minutes or every few hours.

- The behavior appears non-deterministic but persistent over time.

⟐ Commented March 27, 2026 at 2:16 MST

After some investigation, I'm fairly sure the problem is a blocked grille. But it's hard to identify which (if any) of the hundreds of dimples on the left-hand side are actual holes and therefore need cleaning. Is there any information on this?

⟐ Answer accepted March 23, 2026 at 13:25 MST

i added videos:
headphones on macbook
desktop speakers on macbook
same headphones on an old elitebook

⟐ Commented March 21, 2026 at 18:14 MST

⟐ Answered March 13, 2026 at 20:40 MST

⟐ Commented March 06, 2026 at 5:00 MST

⟐ Commented February 28, 2026 at 12:08 MST

⟐ Commented February 21, 2026 at 16:13 MST

⟐ Commented February 13, 2026 at 6:24 MST

In response to your question. Funny enough, the problem occurs even on the mac internal display when connected to the hub, whichever hub, a kensigton and a lenovo one, with different monitors too. The screen stays black on all of them including the laptop one and only when I unplug and click on the power button it gets back , sometimes even having to restart the computer. But I can see some flickers of movement of the mouse and that the apps are running.

Original Response: I am having the same issue. Were you ever able to fix it? It just started on my MacBook Pro M4. It happens only on this Mac. I have tried two different hubs and monitors, and the same issue occurs. If I unplug the USB-C hub and touch the power button on the Mac, then the screen on the Mac comes up, and I can reconnect the hubs just fine.

I am making such a mess.

⟐ Answered January 14, 2026 at 9:38 MST

⟐ Answered January 12, 2026 at 19:32 MST

macbook pro 14 inch 2021 a2442, i already bought the LCD only panel, but no steel bracket

i find guides on youtube guys telling to stick the old bracket to new LCD with tesa tape model 66822, but i can't buy it in my country, can i just use 3M tissue tape?

or it will risk cracking the LCD glass on assembly process cause by pressure or movement while fitting it into bezel?

any tape suggested to use around the bezel surrounding LCD also? i see it was so thin

⟐ Answer unaccepted January 07, 2026 at 4:24 MST

I already have an m3 Pro MacBook Pro and don't want to replace my laptop, but I'd like a better nano-textured screen. So, I'm wondering if this is possible.

⟐ Answered December 24, 2025 at 16:26 MST

⟐ Commented December 23, 2025 at 4:34 MST

Left connected to dock with power delivery via usb c for 24-36 hours and when I came back it doesn't want to turn on

⟐ Answered December 17, 2025 at 6:58 MST

I bought it new today (Dec 1st 2025) at Best Buy (Coconut battery says battery is from jan 2025). This happened on the first unit I received, so I exchanged it. The second unit had the same state of charge (dead) but is charging fine as I am typing this out. Currently coconut battery is claiming I have 103% Health, but this is strange to me, as a Lithium Ion battery should degrade if left at 0% state of charge for long.

TL;DR: Macbook arrived with zero charge, is charging fine, should I return it and buy from Apple directly?

⟐ Answer accepted December 02, 2025 at 12:03 MST

⟐ Answered November 28, 2025 at 17:25 MST

⟐ Answered November 13, 2025 at 17:23 MST

Last night I took the trackpad out again and did my best to reseat it correctly.

I'm still not sure if it's correct--compared to my work laptop (a 2024 MacBook Air) the trackpad is clearly indented a fraction of a millimeter -- you can feel it with your fingers when you swipe off the trackpad. On my MacBook Pro, some edges of the trackpad feel like they are underneath the chassis, while others (especially the bottom right corner of the trackpad) feel perfectly flat with the chassis.

Some questions:

1. What is normal for a 2021 MacBook Pro? Should the trackpad be slightly indented below the chassis? (P.S. this is why the repair manual needs more than just "do it in reverse")
2. As I have things now, is it likely that the trackpad is still rubbing on the screen? I'm probably going to want to replace the screen now, and I don't want to spend $500 and then ruin the new screen because the trackpad still isn't right.
3. If the trackpad is wrong, how can I get it lower? I've already tried reseating it, and it does not seem to want to go any lower in the chassis. Am I missing something?

⟐ Commented November 05, 2025 at 15:11 MST