Cannot log into mac book pro

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If you enter your question into a popular search engine, you can find several destinations with suggested solutions. Or you can take it to the nearest Apple Store or authorized Apple dealer nearby for personal assistance.
Here are similar topics in Apple Support Communities that might be of assistance:
https://discussions.apple.com/article/HT1274
If none of these help, then you need to provide more information so we can attempt to help:
Which model of MacBook Pro is it? (Approximate year of purchase is close enough)
Which version of OS X operating system is installed?
What happens when you power-on the MacBook Pro?
Do you hear the 'chime' at start up?
Is the battery charged?
Is the power indicator on the battery charger illuminated? If yes, what color?
Do you see anything on the screen or does it remain dark?
If it remains dark, when you take the computer to a brightly-lit room, can you see faint images on the screen?
Does the computer ever get to the gray 'Apple' screen with the spinning indicator?
Do you ever get to screen asking for your login name and password?
Do your know the username?
Have you forgotten the password?
Does the password fail to be accepted with a 'shaking' motion?
Are the password hints enabled?
Are there any other users who share your computer?
Can any of them login successfully?

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kmiddlet88,
yes, it could be due to nearly anything listed in your kernel extensions, startup items, launch daemons, launch agents, or user items above. Please check all of your installed third-party software to make sure that the versions which are installed on your MacBook Pro are compatible with Mavericks; uninstall every software package which isn’t Mavericks-compatible. After you’ve done that, boot into Safe mode, and see if you still get the beach ball of doom there. If it doesn’t appear there, restart normally and see if it appears then.

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arcegno55 wrote:
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i have a huge problem becauce i cannot start my mac book pro, i turn on and apear the gray screen with apple logo and round progresive bar, but just not have any change it cud be hours or days its the same, i already try to restore it by the comands (command+R) or (shift+caps lock) when i turn on my computher but alwais same logo screen, please i need help maby im doing someting wrong

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.
a. Boot into 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.”
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 on some models, 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 corrupt 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.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
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
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.
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 Time Machine or other backup.
Step 8
This step applies only to older Macs (not current models) that have a logic-board ("PRAM") battery. Both desktop and portable Macs used to have such a battery. The logic-board battery is separate from the main battery of a portable. A dead logic-board battery 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. You may have to take the machine to a service provider to have the battery replaced.
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. If you can't get to an Apple Store, go to another authorized service provider.

External Hard Drives and iTunes, on Mac Book Pro and PC?

If you transfer your iTunes library from PC to an external hard drive, can you use itunes, from the external hard drive when you plug it into Mac Book Pro?
I'm very confused about this!
All my music is on PC and I want to save it to my external hard drive. But I will no longer be using that PC afterwards.
I would like to use itunes on my Mac but it only has 128 Gb, not enough storage for my iTunes library.
So, can you use your transfered itunes library from the PC to external drive on your Mac?
Another question I have is, when your itunes is on your external hardrive can you still sync, make playlists and add new songs?
I don't know very much about external hard drives, but I need the space.

No. Likely the drive is presently formatted NTFS which is no good on a Mac unless you want to buy spcial software to enable it (given your scenario it is not worth it). The best format for Mac use is MacExtended, but your PC cannot write files to that. The intermediate solution is to reformat the drive to DOS FAT, but as I already said this isn't ideal.
If it were me I would:
1) With the PC copy the entire iTunes folder to the current external, presumably formatted as NTFS.
2) Buy the new second drive I know I will need for backing up both my computer and my old external drive. Format it as Mac extended. In the long run you want to configure this for use with Time Machine but I can't help you with that because I can't run TM. For the time being you are using it to temporarily store files.
3) Using the Mac make sure the new drive is formatted to Mac extended.
4) On the Mac copy the entire iTunes folder from the old drive to the new.
5) With the Mac reformat the old drive to Mac extended.
6) With the Mac copy the entire iTunes folder from the new drive to the old one which is now in the Mac friendly format. Start iTunes with the option key held down as described earlier.
Others may be able to help with some details on formatting drives because I use an older system. I know with my system version when you reformat or partition you lose all files on a drive which is why you have to have somewhere to temporarily store your library. I think they did some changes but I am not sure of the details.

Trouble wifi sync 2 phones 1 mac book pro

In my household there are 2 iphones but one mac book pro. We each have different profiles set up and itunes works fine. She has her itunes profile on her file and i have mine on my profile. However when i try to wifi sync it says that i cannot because " XXX mac book pro is not on"... The mac book is on on my profile, however it won't pick it up. it wants to sync on her profile which i don't understand.
Can anyone help?
Thank you in advance.

Yes you can.
You can set different content for each iphone - music, video, apps, etc.
Take a look at the iphone users guide to see how to set sync options, maybe this will help:
http://manuals.info.apple.com/enUS/iPhone_UserGuide.pdf

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I bought a Mac Book Pro last night. I follwed the set up, completed a migration from my Dell, finished the set up this morning. Now I cannot login to the Mac Book Pro and the log in page has both an apple, and a Dell icon on it. I've tried every password associated with both the Dell PC and my Itunes account. Any ideas? I do not know what operating system it is using as I cannot even log into the Mac Book Pro.

I did try no password. The dell Icon is still there for some reason, at this point I'm glad that Apple phone support was able to help me. I called them and they had me do a password reset by keying "Command" and "R" simulaneously during startup. I still have no idea how the password got messed up in the first place.

Cannot log into mac book pro

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