If your Mac is using a firmware password, the lock icon appears when you try to start up from another disk or volume, such as an external drive or macOS Recovery. Enter the firmware password to continue.
Mac OS X USB LCD
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At the login window, enter your user account password to log in to your Mac. If FileVault is turned on, this also unlocks your disk. You might see a default desktop picture in the background, which might change to your chosen desktop picture when you select your account.
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My MacBook Pro 15" Late 2011 (MacBookPro8,2) with AMD Radeon 6770M exhibited display corruption and associated system crashes/resets over a period of two weeks before it entirely failed to boot. The boot would progress through the grey screen with the Apple logo and spinner, but just when it seems it should have switched to the login screen the Apple logo and spinner would disappear and hang on a blank grey screen.
This time the machine booted all the way through. However, graphics are extremely slow, even just transitions when minimizing windows. I will be taking my MBP to Apple to demand a replacement as the large number of reports of others facing similar issues makes it look like a recurrence of a similar GPU-related failure that resulted in them doing a recall.
The solutions given so far are only good enough advice to get the machine booting far enough to make a backup and move on. Following the advice here will only give you a booting Mac with colour where you can login but without proper acceleration of the GUI. That makes the MacBook almost unusable. Here is an alternative that disables the faulty AMD chip but gives you properly accelerated Intel graphics and much better thermal management than simply removing all AMD/Ati-related kernel extensions.
The Apple Repair Extension program is not available anymore. The only real way to fix this problem is to replace the AMD chip alone. Not the logic board. Not "re-balling", not "reflowing", not "baking". Apple replaced a failed chip with a failing chip. Time and time again. Only replacing the graphics chip is still a costly hardware procedure for such a vintage laptop.
There are two further caveats to know:This is reversible when the SMC/PRAM/NVRAM is reset. If that happens the GPU-power-pref nvram can/has to be set again to force the use of the iGPU from boot-time.
Since this can happen quite easily (and is often erroneously recommended way too many times than it is actually useful), you should probably prepare for such a scenario and create a simple script to greatly speed up the process and also make entering the necessary variable much less error prone:
This setup has now one kext in a place Apple's installers do not expect. That is why in this guide SIP has not been reenabled. If an update that contains changes to the AMD drivers is about to take place it is advisable to move back the AMDRadeonX3000.kext to its default location before the update process. Otherwise the updater writes at least another kext of a different version to its default location or at worst you end up with an undefined state of partially non-matching drivers.
After any system update the folder /System/Library/Extensions has to be checked for the offending kext. Its presence there will lead to e.g. a boot hang on Yosemite and Sierra, an overheating boot-loop in High Sierra.
To prolong the life of this now hacked machine it is advisable to abstain from really heavy lifting over prolonged stretches of time. Strictly follow the usual recommendations for laptops: use on hard surfaces, keep the fans and fins inside it clean. Using any fancontrol software with relatively aggressive settings should also help: like smcFanControl, MacsFanControl, or TGPro (both commercial).
You could go deep down the rabbit hole of debugging your kernel with gdb over ethernet or even ddb over a serial port, but it's almost always faster to just start fresh. Machines with severe hardware issues will usually fail to install a simple OS on an external drive and can save you hours of trying to figure out what went wrong when it's far faster to just build a new "OS" and test if it's stable.
Has your MacBook Pro turned into a brick? Gray screens? Black screen? Refuses to boot?Then the guys on this page have given THE answer. I tried a thousand things until I stumbled upon this for use after cmd+S when pressing power button:
BackstoryIn August this year just three years after buying my MacBook Pro things started to go strange. At first the simple fixes like fsck -fy and starting in safe mode seemed to do the trick but it was only very short-lived.
Then three days ago, nothing I did would make it reboot. I had a brick on my hands.Finally, serendipitously I stumbled upon this page. Being a Terminal Virgin I was extremely nervous about following the instructions but Joy upon Joy it's worked! My computer is back!
As I need it to do video editing work I am rather anxious about how it will cope with the demands of Final Cut Pro X. I shall have to stir up the courage to open it and try. (Checking gmail in Safari is a real pain already. Safari keeps refreshing screen as i move my cursor.Just tried Firefox - that is fine!)
The more important point however is that this is a rather disheartening experience with a product that was very expensive to buy. I am very sad that Apple has not contacted us or made it clear that they will exchange the clearly problematic graphics card.
I brought my 3 year old machine into the Apple store yesterday after being unable to boot the machine in recovery mode, internet recovery mode, safe mode, or normal mode. I could not run the AHT. After running the commands described by @smr I was able to boot right into safe mode and normal mode without trouble.
What I would see when having trouble is the apple logo with progress bar underneath it. The progress bar would load anywhere between 25% and 50% before the logo and progress bar disappeared, indefinitely leaving a plain grey screen up.
cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = ; eol2 = ; erase = ^?; intr = ^C; kill = ^U; lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q; status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W;
You'll need to get a usb-serial adapter and then connect with a console cable. Adapters aren't very expensive.Connecting to the Console Port with Mac OS XTo connect a Mac OS X system USB port to the console using the built-in OS X Terminal utility, follow these steps:Step 1 Use the Finder to go to Applications > Utilities > Terminal.Step 2 Connect the OS X USB port to the router.Step 3 Enter the following commands to find the OS X USB port number:macbook:user$ cd /devmacbook:user$ ls -ltr /dev/*usb*crw-rw-rw- 1 root wheel 9, 66 Apr 1 16:46 tty.usbmodem1a21DT-macbook:dev user$Step 4 Connect to the USB port with the following command followed by the router USB port speed:macbook:user$ screen /dev/tty.usbmodem1a21 9600To Disconnect the OS X USB Console from the Terminal WindowEnter Ctrl+A followed by Ctrl+\Hth,JohnSent from Cisco Technical Support iPhone App
There's a new Mac app called Serial available on the App Store. Full disclosure- I wrote it. We got tired of having to find and install drivers for different serial adapters and devices we have here in order to administer Cisco switches, so we wrote our own terminal that uses its own built-in drivers for the most common chipsets available. There's a free demo available.
Also, as of Mac OS X 10.9, Apple began shipping their own FTDI driver. So, if you're using a USB-serial adapter that uses the FTDI chipset (many of the higher-end adapters do), you don't need to worry about installing drivers and can use the built-in screen command in the Terminal to access serial ports.
Whilst I am using the Serial app successfully, I would still like to understand how one could connect with the min-USB cable without paying $30. It is not a lot of money, to be sure, but it is a barrier to adoption, which is a shame. 2ff7e9595c
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