How do I log in to my macbook pro if when logging in, it stops at the apple logo and won't move?

I logged out of my mac book pro to transfer some files from my hard drive. When logging back in, the computer is not logging in at all... it just get stuck at the white screen at the log in apple, and keep twirling.... and just wont log in... what do I do?

Reinstall Lion, Mountain Lion, or Mavericks without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu. Select Restart from the Apple menu.
Reinstall Mountain Lion or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.

Similar Messages

My macbook pro will not start up. I get the apple logo and the little start up waiting avitar. I tried everything including starting with my back up drive and nothing happens.

My macbook pro mid 2012 will not start up. I was running bitdefender and when I went to see if it was done, I had the apple logo and the loading (winding circle) on the screen. I can not get out of this. I used my back up external drive and it did nothing. It did light up.

samnleosgpa,
you may have faulty RAM. Are you able to boot into your MacBook Pro’s Apple Hardware Test (“AHT”)? If so, try running it to see if it can detect a problem. If you’re not able to run its AHT, and you’ve upgraded your MacBook Pro’s RAM before, try reïnstalling its original RAM and see if you can get past the “-6002F” error code. If you aren’t able to run its AHT, and you haven’t upgraded its RAM or you no longer have its original RAM, then I’d recommend that you make an appointment at your nearest Apple store to have them diagnose the problem.

I have snow leopard installed as an OS. When trying to reboot a MacBook Pro I am getting stuck on grey screen with apple logo and rotating symbol. What can I do?

I have snow leopard installed as an OS. When trying to reboot a MacBook Pro I am getting stuck on grey screen with apple logo and rotating symbol. What can I do?

Maybe this might help.
http://support.apple.com/kb/TS2570

Macbook Pro BIOS requires at least 1 minute before the Apple logo appears and Chime sounds.

When I cold-boot my MacBook Pro, it takes a least 1 minute before I get the chime and Apple logo.
Some background on the problem:
After purchase I almost immediately installed Windows 7 on BootCamp and had no problems.
Around 8 months ago I bought a SSD drive and CD-bay kit, put the original HD into the CD bay and the SSD in place of the original HD, installed OSX on the SSD and formatted the original OSX partition, this broke the Windows install.
I tried in vain for around 2 months to repair the Windows partition without having to reinstall it to no avail, so I swapped the positions of the drives.
Since then the Windows & OSX partitions work fine, however from a cold boot it takes upwards of 1 minute before the Apple logo appears and Chime sounds, after that it behaves as expected (maybe 20-30 seconds and I'm fully booted).
Performing a soft restart behaves as expected too (Chime/Logo appear almost immediately and boot time is lightening fast!).
When I close the lid, it exhibits a similar problem in that it takes about 1 minute before it has gone to sleep and I can't do anything to wake it until that time has past.
It's not the end of the world, but it is slightly annoying, so any help would be greatly appreciated.
My guess is some kind of EFI/BIOS problem, but I can't find any other examples of this problem and have no idea how I might fix.

When in OS X go into System Preferences and Select Startup Disk. Then select the OS X entry, even though you are in OS X, and reboot.
Some times the hardware gets confused as to which OS to boot and figuring it out can take some time. Once you select the OS X partition as the OS to boot to it should startup faster.
If not then you have some other problem that I am not familiar with.
You might also want to do a SMC reset, Google for the instructions found on the Apple KB site.

I have a macbook pro core i7 mid 2012 And update to the latest version 10.8.4 system after updating the system I have the problem appeared to take off the device and stops at the apple logo for about 5 minutes and then enters the desktop How can I solve t

I have a macbook pro core i7 mid 2012
And update to the latest version 10.8.4 system after updating the system I have the problem appeared to take off the device and stops at the apple logo for about 5 minutes and then enters the desktop How can I solve this problem and thank you

If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Step 1
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter "BOOT_TIME" (without the quotes) in the search box. Note the timestamps of those log messages, which refer to the times when the system was booted. Now clear the search box and scroll back in the log to the last boot time when you had the problem. Select the messages logged after the boot, during the time something abnormal was happening. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
For example, if the problem is a slow startup taking three minutes, post the messages timestamped within three minutes after the boot time, not before. Please include the BOOT_TIME message at the beginning of the log extract.
If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
Step 2
Still in Console, look under System Diagnostic Reports for crash or panic logs, and post the entire contents of the most recent one, if any. In the interest of privacy, I suggest you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

How do I fix a initializing problem with my macbook pro? I only get to the blank screen with the apple logo and the "processing something"sign... it just doesn't start the system....

How do I fix a initializing problem with my macbook pro? I only get to the blank screen with the apple logo and the "processing something" sign... it just doesn't start the system....
Please help
Marcelo

If there is no loading bar, it's usually a problem with a third party kext file in OS X itself.
You can press the power button down to force a hardware shutdown, then reboot holding the shift key down on a wired or built in keyboard, this will disable them and you go around and update your third party software.
Gray, Blue or White screen at boot, w/spinner/progress bar
Also take this time to backup your users files off the machine if possible.
Most commonly used backup methods
Sometime that won't work and you need to do more
..Step by Step to fix your Mac

I have an iPhone and when I got it, I had a Toshiba laptop. Now I have a MacBook Pro, but when I try to wi-fi sync my iphone and new computer, it doesn't work because on my iphone it is still trying to sync with my old computer. How I can fix this?

I have an iPhone and when I got it, I had a Toshiba laptop. Now I have a MacBook Pro, but when I try to wi-fi sync my iphone and new computer, it doesn't work because on my iphone it is still trying to sync with my old computer. How I can fix this?

Move the content from the old computer to the new computer.
Sync the iPhone via cable to the new computer and enable Wi-Fi syncing.
It should now be possible to sync via Wi-Fi to the new computer.

Lightroom 5. I've reinstalled it on a macbook pro but when I click "Develop" it states the module is disabled and I need to purchase a licence but I've got a full licence and it's running on another machine. How do I fix it?

Lightroom 5. I've reinstalled it on a macbook pro but when I click "Develop" it states the module is disabled and I need to purchase a licence but I've got a full licence and it's running on another machine. How do I fix it?

Lightroom doesn't launch or returns "Develop module is disabled" error after 5.5 update

Hi, I downloaded Yosemite this evening. I downloaded o.k., it installed o.k. and then it restarted the Macbook and now it seems frozen. There is nothing but a grey screen, the apple logo and a bar that is half black

Hi, I downloaded Yosemite this evening. It downloaded fine, it installed fine and then it restarted the Macbook. Now it seems to be frozen. I have nothing but a grey screen with the apple logo and a bar that is half black and half grey. It's been like this for over an hour. Should I worry or is it still working at something? How do I fix this if it's not still working at installing something. Thank goodness for this poor old pc as backup.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

My macbook pro freezes when I use peripherals, thunderbolt, USB.... and it becomes imposible to edit HD videos, any suggestions?

my macbook pro freezes when I use peripherals, thunderbolt, USB.... and it becomes imposible to edit HD videos, any suggestions?

The next time you have the problem, note the exact time: hour, minute, second.
If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Scroll back in the log to the time you noted above. Select any messages timestamped from then until the end of the episode, or until they start to repeat. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

I had to change to a new Apple MacBook Pro. I deauthorized my old computer, authorized the new one and less than a quarter of my media shows up in the new computer. Everything that was downloaded from a cd is missing. Any help?

I had to change to a new Apple MacBook Pro. I deauthorized my old computer, authorized the new one and the only media that shows up are items with a cloud. Everything that was downloaded from a cd, including personal movie files, are missing. It's as if my former library is gone. How can I find it again? Or is this just Apples way of screwing with me?

No. Firewire and Ethernet are not the same. Ethernet would be used to connect the computers to your network. A Firewire cable is used to connect the computers directly. They are different ports.
The above shows what an Ethernet port and a Firewire 400 port look like.
These are the plugs used for FW800 on the left and FW400 on the right.

MacBook won't boot - stuck showing the Apple logo and the spinning circle.

Hi.
My MacBook suddenly froze when I was using it today. Displaying the spinning beach ball.
It never came out of it, fan running at max speed, so I tried to force restart it (Control-Command-Power), but that didn't work, so I forced the MacBook off (holding the power button pressed.)
When trying to start the MacBook again it couldn't boot. It kept displaying the grey screen, with the Apple logo and the spinning circle below the Apple logo.
I left the MacBook like this for 10-15 minutes, but nothing happened.
Went on to try the following.:
*- Removed the AC-adapter and battery for 5 minutes.*
*- Command-Option-P-R (Resetting PRAM and NVRAM).*
*- Resetting System Management Controller (SMC).*
*- Command-S (singleuser boot)*
And checking the HDD with sbin/fsck -fy
= "The volume ** appears to be OK."
*- Command-V*
Stops on the following line, and fan ramps up to full speed.:
DNSServiceRegister("ssh.tcp."): -65537)
Force reboot didn't work. Had to force it off.
But, nothing helped.
It simply won't boot.
I also tried to boot Ubuntu 7.10, but it hangs after a short while displaying "Kernel panic".
Force reboot didn't work. Had to force it off.
Also tried the option to boot from the first HDD (in the boot menu on the Ubuntu 7.10 disc), but that didn't work either. Only got a black screen, with a blinking cursor top left, and fan ramping up to max.
Again, force reboot didn't work. Had to force it off.
The only thing that has worked so far is exiting the Ubuntu 7.10 CD boot menu, and pressing enter on the prompt that appears.
But, after rebooting, the MacBook still refuses to boot into Mac OS X.
I left the MacBook alone, hoping it would work its way out of the spinning circle, but after 2 h 38 min nothing had happened.
Does anyone know how to fix this?
:. nattugglan

This happened to me last night.
I was updating my iPod and I got a message saying that it needed to do an update. I installed the update and went on ahead putting new songs on my iPod. When it was finished i ejected as I usually do and closed down.
When I went to check me e-mails this morning the Macbook would not boot. It sticks on the grey screen with the Apple and the spinny disc underneath, then it restarts and sticks on the same screen. The last software to be onstalled was Norton 11 on Monday but I have used the Macbook since. I cannot think why it will not boot.
I am loathed to do a reinstall as I have some things on the Macbook that I had not yet backed up.
Any advice?

My macbook won't boot pass the apple logo and the spinning wheel

Some programs on my Macbook starting crashing so I tried restarting it. Now it doesn't load past the grey screen with the apple logo and the spinning wheel.
I've tried installing the Install disc, holding 'c' but nothing happens.
I've tested the hardware holding 'd' in the start up, in which the test can back clean, so I'm assuming it's a problem with the software.
I've followed almost all the troubleshooting solutions on the apple website including restarting the PRAM and SMC, with no success.
However I foolishly followed a solution that was meant for an earlier version of Mac OS X, which invloved starting up in single-user and entering some commands, this appears to have done nothing but i'm concerned it may have done some extra damage.
I have bootcamp installed and I can boot up windows with no problem and even access some of the files on the Macintosh HD.
My backup harddrive broke recently so I haven't got a back up of any of my files either.
My question is, is there any way of fixing this problem or even just saving all my files and data so I can format the hard drive and start again, other than finding someone with a mac and try using the firewire method?
thank you for your time and help.

There's a possible solution but you must have the proper installer DVD for the computer. Assuming you do:
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

My MacBook Air will not turn on. I get a white screen with the apple logo and a spinning star that just does that for hours

My MacBook Air will not turn on. I get a white screen with the apple logo and a spinning star (search icon). It will spin for hours and never go away unless I power off.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

My MacBook Pro stated that it needed to be updated. I clicked yes to restart the computer and update but when it restarted it stays on the gray screen with the apple logo and then pops up, stating "unable to find driver for this platform." What do I do?

My MacBook Pro stated that it needed to be updated. I clicked yes to restart the computer and update but when it restarted it stays on the gray screen with the apple logo and then pops up, stating "unable to find driver for this platform." What do I do?

Boot into Recovery by holding down the key combination command-R at the startup chime. Release the keys when you see a gray screen with a spinning dial.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with networks that require any kind of authentication other than a WPA or WPA2 Personal password.
When the Mac OS X Utilities screen appears, follow the prompts to reinstall the Mac OS. You don't need to erase the boot volume, and you won't need your backup unless something goes wrong. If your Mac didn’t ship with Lion, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.
Don't install the Thunderbolt update -- it's defective.

How do I log in to my macbook pro if when logging in, it stops at the apple logo and won't move?

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