A2141 Boot Loop Issue

**Stephen** · 07-21-2021, 04:01 PM

Board has no signs of water damage. Board had the APPLE error logo when recieved, reset with DFU and restored and installed new os.

OS installed but then it would not post and boot loop with a hard fan spin over and over. The apple logo will not appear and the bar will only reach about a quarter of the way and loop again. I tried DFU again with REVIVE and it still continues.

Attempted Safe Mode and the computer does however boot into safe mode.

So the computer boots into safe mode but will not post normally. Any suggestions? This is new to me and would love the knowledge for this and a fix.

**Stephen** · 07-21-2021, 04:44 PM

Booting into safe mode and the computer boots into safe mode. It allows me to see the error:

panic(CPU 4 caller) GPU PANIC: mux-regs 5 3 7f

so forth...

I looked online and this seems to be a GPU issue these are now being known for? Anyone solve this issue or is this a bad GPU?

**Stephen** · 07-22-2021, 09:04 AM

**mon2** · 07-23-2021, 05:23 AM

https://discussions.apple.com/thread...22#31602727022

**Stephen** · 07-23-2021, 08:24 AM

Hey mon2,

That program is for a 15" 2011 MBP. I see nothing in that discussion about the 16" 2019

**mon2** · 07-23-2021, 09:38 AM

Appears to be a GPU fault cover up on this logic board. The keyword search pointed to the same shared link and issue.

Here is another:

https://discussions.apple.com/thread/251459049

Sad engineering.

**Stephen** · 07-23-2021, 10:15 AM

Yup we are back at the AMD GPU nightmare again. 2011 repeats itself again in 2019 MBP. Hopefully there is a program for these models soon. They are saying its a faulty software issue which is odd because a lot of 16" do not have this issue but a batch of them do. I am considering doing more research on this and hopefully it could be something as simple as a bad cap or resistor that needs to be replaced near the GPU. Wont know till I do a little more digging, worst case it is the GPU itself and it needs to be honored under a new program.

07-21-2021, 04:01 PM	#1
Stephen Meow Meow MEOW! Join Date: Apr 2020 City & State: USA 🇺🇸 My Country: United States Line Voltage: 120VAC 60hz I'm a: Hardcore Geek Posts: 412	A2141 Boot Loop Issue Board has no signs of water damage. Board had the APPLE error logo when recieved, reset with DFU and restored and installed new os. OS installed but then it would not post and boot loop with a hard fan spin over and over. The apple logo will not appear and the bar will only reach about a quarter of the way and loop again. I tried DFU again with REVIVE and it still continues. Attempted Safe Mode and the computer does however boot into safe mode. So the computer boots into safe mode but will not post normally. Any suggestions? This is new to me and would love the knowledge for this and a fix. __________________ MEOWING IN THE IMPOSSIBLE UNIVERSE!

07-21-2021, 04:44 PM	#2
Stephen Meow Meow MEOW! Join Date: Apr 2020 City & State: USA 🇺🇸 My Country: United States Line Voltage: 120VAC 60hz I'm a: Hardcore Geek Posts: 412	Re: A2141 Boot Loop Issue Booting into safe mode and the computer boots into safe mode. It allows me to see the error: panic(CPU 4 caller) GPU PANIC: mux-regs 5 3 7f so forth... I looked online and this seems to be a GPU issue these are now being known for? Anyone solve this issue or is this a bad GPU?

07-23-2021, 05:23 AM	#4
mon2 Badcaps Veteran Join Date: Dec 2019 City & State: Windsor, Ontario My Country: Canada Line Voltage: 110VAC I'm a: Knowledge Seeker Posts: 4,011	Re: A2141 Boot Loop Issue https://discussions.apple.com/thread...22#31602727022

07-23-2021, 08:24 AM	#5
Stephen Meow Meow MEOW! Join Date: Apr 2020 City & State: USA 🇺🇸 My Country: United States Line Voltage: 120VAC 60hz I'm a: Hardcore Geek Posts: 412	Re: A2141 Boot Loop Issue Hey mon2, That program is for a 15" 2011 MBP. I see nothing in that discussion about the 16" 2019

07-23-2021, 09:38 AM	#6
mon2 Badcaps Veteran Join Date: Dec 2019 City & State: Windsor, Ontario My Country: Canada Line Voltage: 110VAC I'm a: Knowledge Seeker Posts: 4,011	Re: A2141 Boot Loop Issue Appears to be a GPU fault cover up on this logic board. The keyword search pointed to the same shared link and issue. Here is another: https://discussions.apple.com/thread/251459049 Sad engineering.

07-22-2021, 09:04 AM	#3
Stephen Meow Meow MEOW! Join Date: Apr 2020 City & State: USA 🇺🇸 My Country: United States Line Voltage: 120VAC 60hz I'm a: Hardcore Geek Posts: 412	Re: A2141 Boot Loop Issue Bump

07-23-2021, 10:15 AM	#7
Stephen Meow Meow MEOW! Join Date: Apr 2020 City & State: USA 🇺🇸 My Country: United States Line Voltage: 120VAC 60hz I'm a: Hardcore Geek Posts: 412	Re: A2141 Boot Loop Issue Yup we are back at the AMD GPU nightmare again. 2011 repeats itself again in 2019 MBP. Hopefully there is a program for these models soon. They are saying its a faulty software issue which is odd because a lot of 16" do not have this issue but a batch of them do. I am considering doing more research on this and hopefully it could be something as simple as a bad cap or resistor that needs to be replaced near the GPU. Wont know till I do a little more digging, worst case it is the GPU itself and it needs to be honored under a new program.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode