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i7 MBP 8.2 AMD 6750M 2011 Crashes, Red Horizontal Lines, won't boots

4807 Views 21 Replies Latest reply: Jan 13, 2014 1:38 AM by muzaaliff RSS
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spritrig Level 1 Level 1 (0 points)
Currently Being Moderated
Dec 19, 2012 9:13 PM

Crash, horizontal red lines, won't boot, SMC PRAM reset, failed boots, successful boot cycles:

For about a week, I have been struggling with crashes, followed by red horizontal lines on the screen, and inability to boot into multi-user mode.  It will boot into single user mode, with red stripes on black background.  To get it to boot again I "shutdown -h now" from single user mode, SMC reset, PRAM reset 3 times, and attempt boots with <command> R two to three times unsuccessfully.  Then, if I am lucky, when I do a boot into single-user mode (power, <command> S), it boots into single user mode with a black background and no stripes, then I "exit" to boot.  If I am unlucky, the black screen will have red stripes or red snow in single-user mode.  After several crashes, I also have to remove my hard drive, and do a disk repair and permission repair, while connected to a different mac, or format and restore ML.  (I have two backups of my personal data.)  The failed multi-user boots are terminated by grey or black screens of death, accompanied by heat and the fands running fast.  The fans also run in single user mode without processor load if they red stripes are on the screen.  A successful multi-user boot is cool without fans running.  I didn't have any crashing problems before switching to ML recently.

Memtest fails in multi-user mode (but not single-user mode):

Running memtest on 8GB RAM in multi-user mode fails at a single address on the most significant byte (with 1 bit difference).  However, memtest does not show a failure in single-user mode, nor with only a single 4GB module in multi-user mode.

Increased stability with gfxCardStatus and Flash unininstall:

Using gfxCardStatus Integrated Only mode, and uninstalling Flash, seems to help.  However, I do get crashes or inability to wake up display which seems to be associated with processes like (google Chrome renderer) which forces gfxCardStatus out of "Integrated Only" mode.

Future plans:

I am in Mexico where RAM is outrageously expensive.  So I will order RAM from the USA and try new 16 GB RAM because it is cheaper part swap than the logic board.  It makes sense to try the cheap stuff first.  I would rather switch to Linux and continue my bioinformatics work than pay and wait to replace the i7 logic board which warranty expired a few months ago.    I refuse to hit it with a heatgun to reflow the BGA solder on the GPU.  I really need the i7 data processing throughput I paid for. 


Does anyone understand the ambiguous memtest results?


MacBook, Minis, Mac OS X (10.5.2)
  • clintonfrombirmingham Level 7 Level 7 (26,695 points)

    Still looks as if you've hardware problems - even if your machine did pass the consumer AHT. I would take the machine into your local Apple Store or an AASP and have them run diagnostics. They've much better tools than are available to consumers.



  • MrSparkle75 Level 1 Level 1 (5 points)

    Hi spritrig,


    Your issue is clearly hardware but it is in no way related to the known issue listed in TS4088. This fault was related to a silicon error with the Nvidia chip used only in the MBP mid 2010 for a number of months, not the ATI in your machine.

    If it is failing the memtest then replacing the RAM would always be a good idea although the look of the screenshots the only way memory could be causing those issues is if the memory is used by the video card (shared memory). The onboard Intel 3000 chip does use the system memory but the ATI does not. You could help rule this out by turning off the onboard Intel video card and only using ATI. In theory if it is one of the video cards then disabling that card should make the problem go away which would be a good work around.


    Of course since you highly suspect that the RAM is faulty, you can't really trust the machine until that's fixed.


    In the end if the RAM swap doesn't fix it then as you have pointed out, the next step is a replacement logic board. Given that it is out of warranty, if the local Apple repair centre is out of your price range then; z-Logic-Board/IF161-093

    Ebay is your friend. z-661-5850-820-2915-B-/200835427447#ht_3776wt_1026


    Good luck.

  • Karl Ihrig Level 1 Level 1 (0 points)

    OK, this nightmare appears to have ended with the OS X 10.8.3 update.


    I could occasionally get several days without crashing by using gfxCardStatus to lock the dedicated GPU to prevent GPU switching.  The crashes and reinstalls of the OS X have been very inconvenient for months.  The Authorized Apple Service Center said the problem was logic board, though it passed tests.  Said the extended warranty didn't apply.  For some reason I could not reproduce the crash there.  Once I got home, the computer was constantly crashing for days, to the point it would consistently crash within a few minutes of booting. 


    A notice for the 10.8.3 OS X update.  I updated.  It has been nearly 24 hours, I have tried to crash the machine by setting GPU switching, installing flash, using Photo Booth, loading web pages that precipitated crashe, watching videos.  I haven't gotten it to crash.


    I optimistically hope the 10.8.3 OS X update fixed it and this keeps up.  There were new Radeon GPU driveers in the update. 

  • Karl Ihrig Level 1 Level 1 (0 points)

    Well it crashed many times after a day of working.  More than 20 attempts to safeboot and restore boot before it works again.  The Auth. Apple Service center here in Mexico says it is $1275 USD for a new logic board and $200 to resolder the GPU/CPU which has a 40% probability of success.  Thinking it might be a bad solder joint, I took the drive out and put the laptop in the freezer (without the hard drive) a few minutes untill it got cool after a couple crashes.  It wouldn't boot after the crash and had horizontal red lines.  I took the laptop out of the freeer, put the room temperature HD back in, turned it on, there were no red lines, and it booted.


    Next times I will try just putting the RAM in the freezer, or cooling the laptop without the RAMs.  I keep the drive at room temperature to avoid condensation on it.  I only put the laptop in for a few minutes to minimise condensation.


    My plan now is get a Mac Mini with fusion drive without a GPU!  So I can have a fast computer while the laptop is getting worked on, and have extra compute power later.  Have the service center resolder the BGA of the GPU and processor on the Macbook Pro logic board, and upgrade to to an SSD. 

  • Karl Ihrig Level 1 Level 1 (0 points)

    It looks like Apple Depot Repair is going to be cheaper (including two flights to the USA) than replacing the logic board at the Apple Authorized Service Center in Mexico.

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