MacBook Pro won't Startup! Please Help!!

I installed 2 softwares this morning, "USB Screen Lock" and " Logonkey". Both allow u to unlock your mac with a usb drive. After installing USB screen lock i tested it out, put my computer to sleep and then came back a few hours later to test out Logonkey. After downloading the free version on their website and installing it, it requierd a restart. When my mac was turning on, it got stuck after showing the Apple logo. All i see is a gray screen with a spinning circle that comes and goes after a couple of seconds. This same thing keeps repeating for hours. I dont know if it's related to one of the softwares or not. I tried to Safe Boot it but it didnt make any difference. Also reseted the NVRAM/PRAM thingy but it didnt make any difference either.
Please help!! :(

You need to reinstall Lion. If that doesn't help, then there's a deeper problem that could or could not be related to the software you installed.
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.

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Go step by step and test.
http://support.apple.com/kb/TS1365
Note: Steps 5 and 6
Step 5
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
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Hi! My MacBook Pro won't start! HELP !!!

Hi! My MacBook Pro won't start! I have tried everything I can think of like Safe Mode (doesn't work), Recovery (does not find Recovery Drive), Booting with OS Snow Leopard Cd (doesn't work)...
I have really no clue about what to do now... I paid quite a lot of money for this computer and am pretty short of money nowadays! Would like to repair with help rather than having to take it to Apple Store.
Has anyone had this same problem?
All I get is white screen + grey Apple and spinning grey disk... it's 100% frustrating! Any help would be more than welcome since I think i've tried EVERY SUGGESTION on this Support Center and Youtube videos...
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Please make a Genius Appointment and take it in for service.

Macbook pro won't startup. Stuck on apple logo with spinning wheel.

When I start up my 15 inch Macbook pro, it gets to the apple logo screen with the spinning gear underneath and it just stays there and does not startup. I have let it sit that way for up to an hour and it juts stays on that screen. Please help!

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 boot failure is to secure your 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 your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
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b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot 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.
c. 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
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot 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.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3
Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot 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 your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot 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, your boot volume is damaged and the drive is probably malfunctioning. In that case, go to step 5.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot 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 reboot as usual (i.e., not in safe mode.)
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Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see Step 1.) Select your 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 reboot as usual.
Step 6
Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
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 proxy servers, or with networks that require a certificate for authentication.
Step 7
Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup.
Step 8
A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
Step 9
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

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Will my hard drive be erased when I do the recovery?
Merely booting into Recovery won't change anything. Depending on what you do next, your data might be affected, so you have to back up first if you haven't already done so.
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MacBook pro won't startup shortly after Lion install any ideas?

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Your assumption was correct I do not understand the messages. Here they are:
12/12/11 5:14:06.000 PM kernel: wlEvent: en1 p2p1 Link DOWN
12/12/11 5:16:02.127 PM mdworker32: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
12/12/11 5:16:40.295 PM com.apple.kextd: Cache file /System/Library/Caches/com.apple.kext.caches/Startup/KextPropertyValues_OSBundl eHelper_x86_64.plist.gz is out of date; not using.
12/12/11 5:16:40.295 PM com.apple.kextd: Rescanning kernel extensions.
12/12/11 5:16:40.000 PM kernel: Resetting IOCatalogue.
12/12/11 5:16:43.760 PM com.apple.kextcache: rebuilding /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache
12/12/11 5:16:44.610 PM com.apple.kextcache: JMicronATA.kext does not declare a kernel dependency; using com.apple.kernel.6.0.
12/12/11 5:16:47.034 PM com.apple.kextcache: JMicronATA.kext does not declare a kernel dependency; using com.apple.kernel.6.0.
12/12/11 5:16:47.503 PM com.apple.kextcache: JMicronATA.kext does not declare a kernel dependency; using com.apple.kernel.6.0.
12/12/11 5:16:49.286 PM com.apple.kextcache: / locked; waiting for lock.
12/12/11 5:17:01.425 PM com.apple.kextcache: / locked; waiting for lock.
12/12/11 5:17:06.504 PM com.apple.SecurityServer: Session 100009 created
12/12/11 5:17:23.875 PM com.apple.kextcache: Created prelinked kernel //System/Library/Caches/com.apple.kext.caches/Startup/kernelcache.
12/12/11 5:17:23.920 PM com.apple.kextcache: rebuilding /System/Library/Caches/com.apple.corestorage/EFILoginLocalizations
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12/12/11 5:17:28.624 PM com.apple.kextcache: Lock acquired; proceeding.
12/12/11 5:17:28.631 PM com.apple.kextcache: /: no supported helper partitions to update.
12/12/11 5:17:28.632 PM com.apple.kextcache: Lock acquired; proceeding.
12/12/11 5:17:28.637 PM com.apple.kextcache: /: no supported helper partitions to update.
12/12/11 5:20:45.355 PM com.apple.quicklook: ImageIO: <ERROR> CGImageReadSessionGetCachedImageBlockData *** CGImageReadSessionGetCachedImageBlockData: readSession [0x7fe672421350] has bad readRef [0x7fe672610c60]

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From the menu bar, select
 ▹ System Preferences... ▹ Network
Click the Assist me button and select Assistant. Follow the prompts. How far do you get?

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Chose startup disk manually:
Hold the Command button during startup, then select your macintosh partition.
Reset the nvram:
Turn on your mac while holding Command-Option-P-R until the chime sounds for the second time.
Safe boot:
Boot while holding down the RIGHT shift button.
If you have a Time Machine, you can use that to restore.
Reinstall via recovery:
Hold down Command-R during boot, then hit reinstall in the menu.
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My macbook pro is not booting, please help me :(

hello,
my macbook pro is not booting in OS X, it displays the apple logo and the spinning wheel, but a circle with a cross appears and the spinning wheel continues, please guys, help me
P.S: my MBP is boot camped

Well, sometimes you can gain access to the drive from another Mac connected to your computer via Firewire cable. It's called Target Disk Mode - Transferring files between two computers using FireWire. Or you already have backups. If you don't then you should consider a backup strategy to avoid this the next time it happens.
There are too many reasons for a drive to become corrupted within the normal course of use. A most common cause is abnormal shutdowns from power outages or not using the normal shutdown procedure because of a system lockup. Software glitches happen or you may be using software that is poorly written, and on and on.
If don't have backups:
Basic Backup
Get an external drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):
Carbon Copy Cloner
Data Backup
Deja Vu
SuperDuper!
Synk Pro
Tri-Backup
Visit The XLab FAQs and read the FAQ on backup and restore. Also read How to Back Up and Restore Your Files.
Although you can buy a complete external drive system, you can also put one together if you are so inclined. It's relatively easy and only requires a Phillips head screwdriver (typically.) You can purchase hard drives separately. This gives you an opportunity to shop for the best prices on a hard drive of your choice. Reliable brands include Seagate, Hitachi, Western Digital, Toshiba, and Fujitsu. You can find reviews and benchmarks on many drives at Storage Review.
Enclosures for FireWire and USB are readily available. You can find only FireWire enclosures, only USB enclosures, and enclosures that feature multiple ports. I would stress getting enclosures that use the Oxford chipsets especially for Firewire drives (911, 921, 922, for example.) You can find enclosures at places such as;
Cool Drives
OWC
WiebeTech
Firewire Direct
California Drives
NewEgg
All you need do is remove a case cover, mount the hard drive in the enclosure and connect the cables, then re-attach the case cover. Usually the only tool required is a small or medium Phillips screwdriver.

MacBook Pro not turning on, please help!!

I have no clue what is wrong with it. I shut the screen so I could move the computer to my room, then bam. Nothing. It's like it's dead. I didn't do anything to update it or add anything to it. It is a MacBook Pro 15in from 2011. The battery buttons on the side don't do anything. When I plug the adaptor in it doesn't do anything. I tried to do the command option control and power button, nothing. I tried the power button plus shift whatever p and r, nothing happened. My life is on the computer, I need it to work. Please help!!

Info from this article may be helpful.
http://support.apple.com/kb/TS1365
Steps 6 and 8
Best.

15" 2013 Macbook Pro won't startup

Hope someone can help,
My early 2013 15" Macbook Pro Running latest Yosemite public beta (10.10.4) won't boot past the password screen, it was working OK this morning went out for a while and when I got home it looked as though it had restarted. Entered my password and the screen changes to show my user picture and name but no loading bar. I've tried to reboot to safe mode however same thing, no loading bar just user picture & my name. Next I tried booting into the recovery screen (CMD + R+ Power) no luck there either, the apple symbol shows with no progress bar. Next tried booting to internet recovery (Option+CMD+R+Power) again nothing globe comes up but stops spinning after a second. I've tried resetting the NVRAM (Option+CMD+P+R) which reset the NVRAM but did nothing for the problem also tried booting in verbose mode (CMD+V+Power) entered password and got the following:
efiboot loaded from device: Acpi(PNP0A03,0)/Pci(1FI2)/SATA(0,0)/HD(Part3,SigEB5D
FEAA-7BB1-44F7-93CB-4E6D33B5019B)
boot file path: \System\Library\CoreServices\Boot.efi
...****ERROR _CreateMenuWithWithIdentifier no image for file: 1_flag_menu_item.
png
**** ERROR_CreateMenuWithWithIdentifier no image for file: 72_flag_other_menu_i
tem.png
**** ERROR _LW__PositionUsersCarouselViews No lw->usersCarouselView or lw->singl
eUserView
**** ERROR ArchiveViewCreateWithOptions ArchiveCopyPNGImage failed for file: log
inui_bootprogressbar.png
root device uuid is '*********-****-****-****-************'
I'm at my wits end think I've tried everything and next stop genius bar but hoping someone can help?

Last option prior making an appointment at an Apple store genius bar is a SMC reset:
https://support.apple.com/en-us/HT201295
The evaluations at the genius bar are FREE.
Ciao.

MacBook Pro won't Startup! Please Help!!

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