I accidentally deleted a system file and my macbook pro will not boot

i accidentally deleted some files and i am guessing now that they were system files. now my macbook pro will not boot. i need help please

What OS version are you on? You're not running iOS 6.1.2 on it.
If you're on 10.7 or 10.8, try the recovery option:
http://support.apple.com/kb/HT4718

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I interrupted a software update and my macbook pro will not boot. I have tried to reboot using the startup disc, I have tried to verify the disc, and repair the disc. It tells me I need to erase and reformat the hard drive then reinstall the operating sys

I interrupted a software update and my macbook pro will not boot. I have tried to reboot using the startup disc, I have tried to verify the disc, and repair the disc. It tells me I need to erase and reformat the hard drive then reinstall the operating system. I do not have a back up of all my applications, my garageband music and other things. I also do not have time capsule set up on this machine, but I do have a 2 TB time capsule.
Is there anyway to back up this corrupted drive so I can restore my applications later?

There's an old saying. If you don't have a backup disc, then there must be nothing important to backup. That's just lesson #1. Lesson #2 is to never interrupt a software update. Not a good thing.
OK, I'm sure you know this. It just upsets me to read your story, knowing you have a lot of important stuff on your hard drive, and didn't use time machine.
You're pretty much in a bad place. My only hope for you is to boot to your Installation Disc, then using disk utility see if you can save the internal hard drive (by fixing what can be fixed). You might be able to see your user folder and some of your apps. I wouldn't even consider copying the library, because who knows what's been corrupted in there.
Good luck.

Macbook Pro will not boot beyond grey screen. System freezes.

My Macbook Pro will not boot-up or get beyond the grey screen (with spinning gear wheel.) I've tried all the recommended actions: resetting PRAM, disk repair, permissions repair, re-boot in safe mode etc but still the problem persists. When viewing the safe-boot in verbose mode, the system seems to hang at the stage when it's checking the Airport & Ethernet - the last line on the page reads: "AppleBCOM5701Ethernet: 0 0 setFixedSpeed - logic error, speed any?"
Any ideas how to fix this without doing an Archive & Install?
I'm assuming that if I do an "Archive & Install" then I will lose all my Applications (VLC, Handbrake, MS Office for Mac etc.) Will this actually be the case? Will I lose them.
Any help gratefully received. Many thanks.

jfromplymouth wrote: ...I'm assuming that if I do an "Archive & Install" then I will lose all my Applications (VLC, Handbrake, MS Office for Mac etc.) Will this actually be the case? Will I lose them...
Archive and Install just affects the System files, so any apps you have should still be available afterwards. The Installer on the disk that came with your Mac, when you bought it, will tell you this before you proceed. Of course, you can always back out of the Installer if you feel chicken.
Notwithstanding it is still necessary to backup everything. You need to check that Time Machine is set to also backup your Applications folder. It might be set not to do this.
It may not be necessary to worry about this if you have the original installer disc(s). I think any stuff downloaded from iTunes etc can be re-downloaded. However, it's probably quicker to get Time Machine to backup your apps if you can afford the HDD space. It's bound to be quicker than re-downloading the stuff plus any updates. And of course there's those Apps that you have but forgotten about. What about them?

MacBook pro will not boot up. Blank screen with message File is possibly corrupted. Checksum does not match etc

MacBook Pro suddenly will not boot up. Blank screen with message File is possibly corrupt. Header checksum does not match, etc

Hi s.cheslik,
It seems your MacBook Pro will not boot properly and it displaying an error message. Based on the information you have provided, it appears your MacBook Pro needs to be serviced. The following link should help you get started with the process and has links with additional information on topics such as warranty and service pricing, battery replacement, and express replacement service.
Apple - Support - Service Answer Center
Thank you for contributing to Apple Support Communities.
Take care,
Bobby_D

MacBook pro will not boot. I get the gray screen, an apple icon and spinning wheel. Tried to start in safe mode but get the same screen. The only thing different was that I loaded the zedge sync app yesterday. Now getting this problem.

Macbook pro will not boot. I get the gray screen, an apple icon and spinning wheel. I tried to start in safe mode, but get this same screen. The only thing different is that I added the zedge update app to do a sync for adding ringtones to my apple cell phone. How can I get a good boot. I am fairly new to apple computer.

Reset PRAM: http://support.apple.com/kb/PH4405 and then try a normal boot.
Run the Startup Manager to select Startup disk: http://support.apple.com/kb/HT1310
If those did not work your disk may be sick or dying. The top priority at this point is to make a backup copy of your data.
Check the health of the disk. Boot in Recovery Mode (Boot, Command-R). Run Disk Utility. Click on the upper left disk icon. Does the S.M.A.R.T. status say “Verified”? If not the disk/SSD is unhealthy and needs to be replaced. Even if it does not show “Verified” you can still attempt a backup.
Click on the icon indented below, usually called “Macintosh HD” and Verify Disk. If it finishes with a green “OK” message then all is well with the disk. If it shows errors in red then you have found a problem to address once the system is backed up. Do not attempt software repairs until you have secured the data.
If the disk will not show up at all in Disk Utility as your ran the tests above then it may be dead or it may have a bad internal SATA cable. A trip to an Apple store for confirmation would be in order.
If you have an external disk drive you can use as a backup drive then do so. If not Google “Hitachi USB 3.0 external hard drive 1TB” to purchase one or go to a brick-and-mortar store (including an Apple store) to pickup one. Any 1 TB external drive will do.
Assuming it is still breathing you can try to recover the data without booting from the sick disk.
Reformat the external disk. (This will erase all data on the external disk.)
Boot in Recovery Mode. Start Disk Utility. Plug in the new disk. Select it’s disk Icon (the second one down, left justified). Select the Partition tab.
Partition Layout > Single Partition
Name: Emergency Recovery 1 (or whatever name you wish to use)
Format: Mac OS Extended (journaled)
Options… > GUID Partition Table > OK
Apply
Select the Restore tab.
Drag the old system volume (Macintosh HD) to Source.
Drag the new disk volume (Emergency Recovery 1) to Destination.
Click on Restore.
It may take a long time for the backup.
If that will not complete post back for other emergency data recovery methods, including those from a brody.
If the backup succeeds, use the First Aid tab in Disk Utility to select the old volume (Macintosh HD) and Repair Disk. If it does not finish with a green OK message try to repair it once or twice more. If it repairs with a green OK message, will it boot normally? If not, boot from the Recovery Partition and reinstall OS X.
If it is still not healthy, post back for further instructions.

Any DVD I rent from the red box or at the library my 27"iMac and my MacBook Pro will not operate.

Any DVD I rent from the red box or at the library my 27"iMac and my MacBook Pro will not operate. The Mac's take the DVD's and it sounds like it's trying to run the DVD. After about 10 seconds the Mac just spits it out. I am using the newest version of the Beta Yosemite OS X 10.10.3 Version. I'm a little more than a novice user, just to keep in mind... Can anyone help me fix this problem?

Aside from running the beta (and not being allowed to discuss anything at all about it anywhere including these forums), I have found that some commercial DVDs (and actually also music CDs) are coded such that they will not play in any device that could ostensibly be used to copy the content due to DRM/copyright issues. The DVDs played just fine in both of my DVD players hooked up to my TVs and the music CDs worked in my stereo system.
Have you tried to play those in a regular DVD player?

HT4718 I recently upgrade my OS and now my MacBook Pro will not boot up

I recently upgrade my OS and now my MacBook Pro will not boot up

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
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.

My Macbook Pro will not boot up. I can hear the sound that it has started and then goes into an infinite loop.

My Macbook Pro will not boot up. I can hear the sound that it has started and then it goes into an infinite loop.

What model MBP and which version of OS X? Sounds as if the hard drive may have failed. If you have an installation disc, try booting with it. If your machine came with Lion or Mountain Lion, try booting to the Recovery partition - Command and R keys held down while booting.
Clinton

My macbook pro will not boot. It gets the grey screen with the apple until the bar is half way across and then shuts down. The only screen I can get to is in safe mode and I don't know what to do with that

my macbook pro will not boot. It gets the grey screen with the apple until the bar is half way across and then shuts down. The only screen I can get to is in safe mode and I don't know what to do with that

Mac OS X: Gray screen appears during startup - Apple Support

HT204384 I have a SanDisk Memory Stick PRO Duo and my MacBook Pro will not read it.

I have a San Disk Memory Stick PRO Duo 4GB and my MacBook Pro will not read it. I have also connected the card into a card reader and connected it to the USB port and nothing happens. This is really frustrating. Why wont my computer read my card?

Are both , the printer and the mac in the same network?
You can find the right software and instructions here:
http://welcome.solutions.brother.com/BSC/public/eu/eu_ot/en/model_top/colormfc/m fcj870dw_us_eu_as.html?reg=eu&c=eu_ot&lang=en&prod=mfcj870dw_us_eu_as

I accidentally deleted the systems file on my macbook.

In preparation for upgrading from Leopard 5.8 to Snow Leopard I backed up my entire macbook system to an external hard drive. Then I deleted some files prior to installing Snow Leopard but I accidentally deleted the systems files. I can't boot the system now. How do I resolve the situation?

Thanks for the reply.
The backup was via Time Machine.
No, I have not tried booting from the SL 6.0 disc using the c key or Option/alt key. When do I push the option/alt key?

System upgrade on MacBook Pro stopped and my MacBook Pro will not restart.

MacBook Pro will not restart.

Reinstall OS X without erasing the drive
1. Repair the Hard Drive and Permissions
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. 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.
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. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
If you are unable to get it working using the above, then you will need to try this:
Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer. Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the "C" key. Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. 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.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.) Click on the Partition tab in the DU main window. Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer. Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
         Assistant will complete the installation after which you will be running a fresh
         install of OS X. You can now begin the update process by opening Software
         Update and installing all recommended updates to bring your installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
And, if this doesn't help, then the HDD is failing or has failed.

When I turn on my MacBook Pro will not boot up but it will have the loading gear revolving and the apple symbol is crossed out

After installing ProTools 10 and I have a drivers I tried to restart my MacBook Pro, but it will not boot up. It was just working fine and I restarted it because I ran a java upgrade and it will not boot. I tried to cold boot it, but it still allows me to login in pass the encryption login the the loading symbol keeps revolving and doesn't stop.

If you've activated FileVault, only the users that were authorized to unlock the startup volume will appear in the pre-startup authentication dialog. Once the system has started up, all users will appear in the login dialog.
To authorize more users after the volume has been encrypted, select the FileVault tab in the Security & Privacy preference pane. Click the lock icon in the lower left corner and authenticate to unlock the settings, if necessary. Click Enable Users...
You should only enable users whom you trust implicitly with all data on the system, not just their own data.

My MacBook Pro will not boot up. I just get a grey screen with a "no entry" symbol and a spinning time icon. Any ideas as to how I can get over this issue?

Hi, I tried to start my MacBook Pro are 2 weeks and all I get is a grey screen with a grey no entry sign and a spinning timer. I have tried a reboot with shift cmd and v and it seems to be looping and referring to an external device. Only the power is attached. Can anyone provide advice on how to get past the grey screen? Many thanks.

Does the system automatically back up data?
No.
As you can getto the Recovery partition, you can at least verify your disk using Disk Utility. If it reports that repairs are needed, you can try to repair but I've found that nearly 100% of the time repairing the disk inevitably FAILS. You should be prepared to, 1) buy a new drive for your machine and, 2) buy a good (see here) enclosure for your damaged drive to try to recover data.
After you get everything fixed, use at least two backup methods to keep your data secure. See Most commonly used backup methods.
Clinton

MacBook Pro will not boot - have replaced hard drive and problem persists

Macbook Pro Mid 2010
4gb ram, 2.4 GHz Intel core 2 duo
Originally when I received a folder with a flashing question mark upon startup, I assumed I had a failed hard drive. I went ahead and installed a new 500GB hard drive in my machine and installed OS X Snow Leopard. I upgraded to OS X Mavericks, and I had everything running properly. The next day, I went to startup and my Mac would not boot again. The dreaded folder and question mark were back.
I'm wondering what else could be causing this problem? Is it something I can diagnose and repair myself or will I be better off taking it into someone at this point?
Thank you!

You can try replacing the hard drive cable...
Have you tried resetting the PRAM and SMC?
Does the hard drive boot when connected externally?

I accidentally deleted a system file and my macbook pro will not boot

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