Why is my macbook pro stuck on the gray screen?

I turned on my macbook today and tried to turn it on, only to find out that it decided to stay on the gray screen for quite a while. I have tried to re-boot the system quite a few times, but nothing has helped. I then googled my situation to find a solution. I came across a post from someone who recommended holding down command + V and the power button. A black screen then appeared with a bunch of white writing. I haven't touched it because i dont want to mess it up any more that i already have. PLEASEEE HELP ME!!! Thank you!!!!

Just take it to the apple store. Same thing happened to me and they fixed it by going on the black screen but dont mess up with that screen let them fix it.

Similar Messages

Macbook getting stuck on the gray screen with the apple

Please help!
I had to turn off my computer this morning manually becuase it froze and when I went to turn it back on, it just gets stuck on the gray screen at the beginning. It will have the apple logo on it for a while and then switch to a "folder" with a questions mark in the middle, then to circle with a line through it and will never actually boot up. Please, any thoughts would be wonderful!

Do you have your install discs with you? If so, insert Install Disc 1 into the optical drive and boot the computer while holding the C key. The OS X Installer should load. Choose a language to proceed. Once that window is gone, menus should appear at the top of the screen. From the Utilities menu choose *Disk Utility*. In the left-hand column, highlight your hard drive's icon--the one that lists the xx.x GB capacity/manufacturer. If you have installed Windows via BootCamp, choose the *Macintosh HD* icon. Choose the *Repair Disk* button. If anything cannot be repaired, post the error here. If nothing needs to be repaired, click the *Repair Permissions* button. Also check the *S.M.A.R.T. status* of the drive in the lower-right corner.
Best of luck!
~Lyssa

Why is my macbook pro stuck on a blue screen

I was downloading a program that was put onto a disk image, then my macbook battery died (forgot it was unplugged). When i plugged it back in and booted it back up, it did the usual tone and apple logo/spinning gear. Shortly after it would go to a pale blue screen and occasionally have a spinning gear, but no matter how long i wait it stays on the same screen.
i have tried everything here: http://support.apple.com/kb/TS2570
except i't wont let me start from the install disk (it just goes to the blue screen)
i have the mac os x install disk one and two, but im also not sure what one to put in and if these are the right ones anyways.
I also have a windows xp partition that i CAN access without getting stuck on the blue screen.
So, is the hard drive corrupt even though i can access the windows partition?
Do i need to replace the hard drive?
i cant go to an apple store and get it fixed, i just dont want to drive there (but i will if i need a new hard drive)
this is my first mac and i have only basic knowledge of the operating system.
i think it was running on 10.6 (snow leopard), but i only have the install disks that came with my mac.

To fix your issue is too complicated and lengthy to go into all of it here as it sounds like a hardware issue, it will require the services of person very familiar and experienced with Mac's to first recover your data and then restore OS X back to a functional state which may or may not require new hardware/software installed.
If your under warranty or AppleCare, take it in for service.
You can also hire the services of a local Mac computer support technician experienced in these matters.
Have them look at your Wifi, RAM amount, extra storage and computer backup proceedures in the process.
Good Luck.

Macbook Pro stuck at the login screen

This morning I dropped my laptop by catching the charging cable the laptop fell on the floor but everything seemed to be normal.
I then decided to back up straight away so I started time machine. I stupidly started doing some user instensive things on my mac whilst this was going on e.g. playing a game which can sometimes crash. When it did crash I left it for half an hour or so to see if it would bring up force quit or switch out of the crashed programme. This didn't happen so, like i've done in the past, I hard reset holding down the power button.
When I turned on the mac everything seemed normal I got to the login screen and it offered to startup the computer as it was before I restarted. This was a bit odd as I normally get this message when i've actually logged in. My Backup drive also asked for a password which was also strange for the same reason. I then attempted to login to the computer I typed my password in. It was accepted and the screen went white and then went back to the login screen.
I repeated this a few times, restarting etc before I tried using disk utility in recovery mode. When verifying the disk no problems were found. Disk permissions found two problems, which unfortunately I can't remember (1 was to do with the library), I then repaired disk permissions. I tried to start again but got the same problem.
I then stared in safe mode. I'm now meant to be in safe mode but i'm not 100% sure as everything seems the same except everythign is very slow.
Midbackup my computer crashed so i'm wondering if there are any problems there (especially as it was the first backup I made on my new external HD). I'm now trying to backup in safemode but i'm not sure if that's the best thing to do (as not everything might not copy over and I could potentially ruin the first backup to my new external HD). Can anyone give me any advice on what to do next, tell me where I can test whether i'm in safe mode or not and let me know if I should be backing up in safemode.
Thanks in advance
Alex
Macbook Pro August 2011 13 inch
500GB HD
4GB RAM
2.3 GHz Intel Core i5
Lion 10.7.3
UPDATE
After entering successfully what appeared to be safe mode, I restared the computer and tried logging in normally. I got the white screen (as normal) before I reached the login screen, and after entering my password it eventually did log me in. Everything seems normal but I still want to be sure. My computer seems very slow. I only have 1.25GB/4GB free of RAM and I only have two safari tabs open. I'm backing up now but i'm still a bit concerned.
Message was edited by: Alexander Richardson

there is no installation cd, i have hit the command r function and attempted to reinstall from the recovery option stored on the computer. I am connected to the internet. It keeps saying downloading extra components and then once completed just goes b ack to main screen with my old log in informaiton as if nothing has happened. I also attempted to try to do a back up from a restore log and nothing on that as well.

My Macbook is stuck on the Gray screen again when it starts up:

My Back drvie that I all my stuff saved to I'm out of space on and when I tried to back up my Mac last time it said the backup failed- since the backup was to big.
I do not want to reinstall the OS since I have I have a alot of webpages in iWeb and my iTunes stuff & all of my Documents and photos & my mail, that I do not want to loose.
Do you think Apple work try and recover the things on the hard if I ask them nicely?
What should I do.
Message was edited by: blark
Message was edited by: blark

Few minutes ago i was answering nearly same question. This happened to me either. Try reinstalling the os. If you have a dvd ten with the dvd but if you have lion shut off, turn on and immidietly hold the option key and click recovery hd or whatever its called. I hope this works for you. Try reading https://discussions.apple.com/message/20088037#20088037. I answered how to do it. I hope this helps you.

Why does my macbook pro stop loading the webpage every time i try to access netflix or youtube?

Why does my macbook pro stop loading the webpage (in safari) every time I try to access netflix or youtube?

Back up all data before proceeding.
This procedure will unlock all your user files (not system files) and reset their ownership, permissions, and access controls to the default. If you've intentionally set special values for those attributes on any of your files, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. Do so only after verifying that those settings didn't cause the problem. If none of this is meaningful to you, you don't need to worry about it, but you do need to follow the instructions below.
Step 1
If you have more than one user, and the one in question is not an administrator, then go to Step 2.
Triple-click anywhere in the following line on this page to select it:
sudo find ~ $TMPDIR.. -exec chflags -h nouchg,nouappnd,noschg,nosappnd {} + -exec chown -h $UID {} + -exec chmod +rw {} + -exec chmod -h -N {} + -type d -exec chmod -h +x {} + 2>&-
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
You'll be prompted for your login password, which won't be displayed when you type it. Type carefully and then press return. You may get a one-time warning to be careful. If you don’t have a login password, you’ll need to set one before you can run the command. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The command may take several minutes to run, depending on how many files you have. Wait for a new line ending in a dollar sign ($) to appear, then quit Terminal.
Step 2 (optional)
Take this step only if you have trouble with Step 1, if you prefer not to take it, or if it doesn't solve the problem.
Start up in Recovery mode. When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. A Terminal window will open. In that window, type this:
res
Press the tab key. The partial command you typed will automatically be completed to this:
resetpassword
Press return. A Reset Password window will open. You’re not going to reset a password.
Select your startup volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button.
Select
 ▹ Restart
from the menu bar.

Macbook pro stuck/hangs at login screen ??

Macbook pro stuck/hangs at login screen and no any controls while i restart last time..3 days before i found many solutions but no one is perfect like PRAM/SCM format command option+p+r and other many but no any perfect solution which can fixed my issue..please help me asap i am so much upset for that coz i am developer and there is many of the data , i also run windows on it win 7 so now i am running with that i have latest 2011 mac OSX 10.7.5 with Core i5 ,4GB, 320 GB so please help me to resolve this issue i am waiting thanks in advan
Regards,
Muneeb
Developer
<Email Edited by Host>

Macbook pro stuck/hangs at login screen and no any controls while i restart last time..3 days before i found many solutions but no one is perfect like PRAM/SCM format command option+p+r and other many but no any perfect solution which can fixed my issue..please help me asap i am so much upset for that coz i am developer and there is many of the data , i also run windows on it win 7 so now i am running with that i have latest 2011 mac OSX 10.7.5 with Core i5 ,4GB, 320 GB so please help me to resolve this issue i am waiting thanks in advan
Regards,
Muneeb
Developer
<Email Edited by Host>

My White Macbook is stuck at the loading screen, and disk utility, safe mode doesn't work either. What should I do?

I went on vacation a few days ago and in El Salvador, they have this mobile broadband sticks. Well, I was using one until it gave me a network error. After that, it shut down my computer entirely. The first time it happened, I didn't think much of it. I took the battery out and put it back in for it could work. It happened another two times, and after the third time, my MacBook stays stuck at the loading screen, and it will take 5-10 minutes on that screen, before it shuts down, or it wouldn't turn on at all. I've tried booting into safe mode, but it appears to not boot into it. I've tried resetting the Pram, and using disk utility, but that still won't work. I don't know what else to do to make it boot into OS X Lion.
I'm an AP student, and the majority of my work is in that computer, and it is very important! What can I do? Not only that, but I enter school in a few weeks and I need the AP work by the time I enter.
What can I do? Can someone help?
Thanks

Reinstalling Lion Without the Installer
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. Alterhatively, 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 the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
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 click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

My apple wont turn on. it gets stuck on the gray screen with the spinning wheel and the apple on the screen

My macbook air turns on but not completely, it gets stuck on the grays screen.   It shows an apple an a spinning wheel and that is as far as it gets. sometimes I can get to an screen that shows macintosh hd and i clicked on it and the computer turned off.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
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 you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
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, or if a firmware password is set, or if the startup volume is a Fusion Drive or 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 10. 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.

Hi i am having a big trouble. MY mac wont start past the gray screen. I tried starting on safe boot, single user user mode , recovery mode. Everything it gets stuck on the gray screen i even tried reinstalling it , same thing what should i do?

MY mac wont start past the gray screen. I tried starting on safe boot, single user user mode , recovery mode. Everything it gets stuck on the gray screen i even tried reinstalling it , same thing what should i do? it lets me reinstall sometimes Sometimes.... it is weird.

orshikhfromsc,
boot from the Mac OS X Install DVD that originally came in the box with your MacBook Pro (by holding down the C key as it starts up). When the desktop appears, select Disk Utility from the Utilities menu and erase your internal disk. After it’s been erased, reformat it. After it’s been reformatted, exit Disk Utility and reïnstall the version of Mac OS X from that DVD onto your internal disk. After that version of Mac OS X has been reïnstalled, boot from your internal disk and run Software Update to get it up-to-date within that version; that should allow you to redownload and reïnstall Mavericks, if desired. If Mavericks is reïnstalled, run Software Update again to get it up to date.
If you no longer have the two grey installation DVDs, you can purchase a replacement set from either Apple or iFixit.

I'm stuck on the gray screen on start up

Tried all the tips I can find but no joy. Able to boot in safe mode but nothing else. Can't use Lion Recovery and unable install Snow Leopard from disk as it gets stuck on the gray screen again. Any suggestions?

It appears you may have a bad Recovery HD partition. By any chance did you create a USB Recovery HD for emergency uses? If not, then I think you may have to first reinstall Snow Leopard then re-download and install Lion. Since you can boot into safe mode you can create a backup of your files because reinstalling Snow Leopard requires erasing the drive:
Downgrade Lion to Snow Leopard
1. Boot from your Snow Leopard 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 Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard (see below.) I suggest you make a separate backup using Carbon Copy Cloner 3.4.1.
If you have Snow Leopard Time Machine backups, do a full system restore per #14 in Time Machine - Frequently Asked Questions. If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion files.

My iMac won't boot up fully. It stays stuck in the gray screen with the pinwheel spinning, then after about 5 minutes just shuts itself off.

My iMac won't boot up fully. It stays stuck in the gray screen with the pinwheel spinning, then after about 5 minutes just shuts itself off.

Try SMC Reset (unplug it from the back of the computer for 10 seconds then plug it back. in)
Try PRAM Reset Cmd + OPtion + P + R on start up.
Try safe boot - hold down shift on start up.
Try booting to install dvd (C on start up) or recovery hd (CMD + R) and using disk utility to run a verify and repair. If you still can't boot after that reinstall the operating system. If you can't find the disc or it wont boot to the disc.
Try single mode which is cmd+S on start up. It will open with a terminal looking window in the terminal. type in /sbin/fsck -TL. If it returns *system has been modified* continue to type that command in until it comes back with macintosh hd seems to be ok. If after 5 tries it still gives you system has been modified. You may have to replace the hard drive.

I have an iMac G5 stuck on the gray screen with spinning gear. I woke up to it being stuck on a blue screen, then force quit and now it's stuck on gray with spinning gear.

I have an iMac G5 stuck on the gray screen with spinning gear. I woke up to it being stuck on a blue screen, then force quit and now it's stuck on gray with spinning gear. Please advise.

If you have a G5 then it's a PPC (Power PC) based iMac, this is an Intel iMac forum. Try the Gray screen appears during startup link for troubleshooting steps. I suspect the HD has crashed.

My Macbook is stuck at the loading screen (the apple with the spinning circle beneath it). I went to Best Buy, they told me to call Apple Help and ask them to restore my unit. But Apple help wont help me without charging me. Help please !!

My Macbook Pro is stuck at the loading screen (the apple with the spinning circle underneath). I went to Best Buy to get help, and they told me to call Apple Help and ask them to 'restore my unit', which he said is a matter of only about 4 mouse clicks. If it was so easy, I didn't understand why he couldn't do it for me. But he said that even though I have a 3 year warranty and protection plan with them, they were not responsible for this type of problem. Whatever.
Anyway, so I called Apple Help, and even though he was familiar with my problem, it's been more than 90 days since I purchased the laptop, therefore I'd have to set up a service agreement to get his assistance, meaning I'd have to PAY him. So now i'm stuck, and I'm just hoping somebody knows what to do to help me
I don't have any disc that I apparently need, and I don't remember ever getting one. However, if there is some other way to fix this issue, please let me know. Thanks for your time and assistance
Brenna

HI, have you blown the dust out lately?
Does it boot better/further if allowed to cool?
If you're sure the RAM is good, try the Hair Dryer trick...
http://discussions.apple.com/message.jspa?messageID=13240047#13240047
https://discussions.apple.com/message/15223603#15223603
https://discussions.apple.com/message/15499912#15499912
https://discussions.apple.com/message/15613068#15613068
https://discussions.apple.com/thread/3270112
https://discussions.apple.com/message/16053892#16053892
No power light at all...
https://discussions.apple.com/thread/3692775?tstart=0
It can show on any G5, and even many other computers & electronic devices of the period.
http://www.macintouch.com/reliability/pmg5.html
http://lowendmac.com/ppc/power-macintosh-g5.html
And see this last one in particular...
https://discussions.apple.com/message/16781690#16781690
Heat gun better...
https://discussions.apple.com/thread/3916312?tstart=0
If we don't get more help or answers here, feel free to join my site & ask...
http://x704.net/bbs

My macbook pro crashes showing a gray screen

i use my Macbook pro with logic pro and a usb keyboard and a external firewire soundcard MOTU 828 mk3.
Of late my macbook just shows a silver gray screen saying please hold down the power button to shut down your comp.Very annoying please help as iam a proffessional music programmer.
THIS IS A VERY RANDOM OCCURENCE........Mani

Reinstalling Lion/Mountain Lion Without Erasing the 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 the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
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 click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

Why is my macbook pro stuck on the gray screen?

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