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

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I am having trouble with my MacBook Pro. I get a blank screen with a flashing document file with a question mark in it, yes I have tried to install Mac OS X with the original disk but I get no choices of where I wish to install Mac OS X. Please help ;(

I am having some trouble with my computer, what happened was: I was playing on a game, I played with a magnet, it started to go slower and slower, I pressed F9 then it went slower and then it went to a blank screen with a flashing document with a question mark on it. I tried the original OS X installation disk but when it came to choosing the area of which I save it, it showed no areas.

Startup your Mac while holding down the Option key. That should prompt the Startup Manager window where you can select the startup disk then click Restart.
If the startup disk is not available from that window, you may be able to repair the disk.
Help here > A flashing question mark appears when you start your Mac

Macbook Pro won't boot past grey screen with Apple logo and then shuts off

This is a long story...
This morning, I would turn it on and it'd go to the grey screen with the Apple logo for a few seconds and then go to the icon that is a circle with a line through it. After reading online, I was able to boot it up in Safe Mode. I messed around a little bit in system preferences thinking I could fix it on my own, not really knowing what I was doing (I'm a *******). I went to Startup Disk in Preferences. I chose the MAC OS X, xxxx and then clicked the lock to prevent further changes and then clicked restart.
Now when I turn on the macbook, it goes to the grey screen with the Apple logo for at least two-three minutes and then just shuts off. Won't boot into Safe Mode now. Please help. I already tried the Command-Option-P-R keys trick like five times.

If you have a full retail DVD for 10.6 you can boot from that by holding the C key during startup...but you will then be in install mode if that is what you want to do. At least go ahead and see if it will boot ok from the 10.6 disk and then you can decide what you want to do further.
Apple does not have 10.5 for sale anymore from what some other users have said on here so if you want to go that route you will have to find a copy for sale such as from eBay or one of the Mac resellers.
Before taking the machine to someone, try booting from 10.6 and see if that works...that way you can narrow down problems the machine may be having.

Late 2008 MacBook Pro won't boot; only gray screen with Apple, spinning gear, and then the mouse pointer.

Thanks to all in advance! Okay, last night I was trying to encrypt a Time Machine BackUp disk (Seagate 500GB Back Up Plus) and a dialog box popped up and said "POSIX could not..." And then whatever was next. So I unplugged the drive, plugged it back in, and the files still showed up, so I was like "oh okay so it's not screwed up." The next I try and boot my MacBook Pro, and of course it doesn't. The gray screen comes up, the logo shows up, the gear is spinnin, the it goes away and the mouse shows up. But that's where it stops. And sits. And sits. And sits. So I force it to shut down. I run through this many more times, as well as attempting the Recovery Mode, Safe Boot, and to no surprise, it doesn't work. So I go grab my trusty Snow Leopard disc, pop it in, ctrl-C on start up and it loads. So I select the option of restoring from a Time Machine backup and plug in the external drive only to not see it in the list. So I go to Disk Utility, and find out that the entire external drive has been erased and renamed disk8s2. So I go to my internal drive, but it shows how much has been used and it matches to how much as of last night. So I tried repairing the disk and restarting and of course it doesn't work. So now I don't know what to do. Really I'll take any suggestions besides buying anything (I'm only a 16 year old guy haha). So yeah. Thanks!

The encryption never actually followed through.
You started it, though. That makes the volume inaccessible to any OS X version before 10.7.

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?

HT3964 My MacBook Pro will not boot up. The screen remains dark although the the comput makes the characteristic start up sound. The sleep light is showing.

MY MacBook Pro will not boot upThe screen is dark, but the sleep light is on and it makes the characteristic start up sound.What is wrong?

There is always the forum for MBP
MacBook Pro
https://discussions.apple.com/community/notebooks/macbook_pro
https://discussions.apple.com/community/mac_os?view=discussions
http://www.apple.com/support/macbookpro

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

Macbook pro will not boot even to grey screen ??

my macbook pro will not boot even to grey screen ?? Just stopped wprking after I closed the cover.

What other indications are there, does the white light turn on, solid or pulsing?, do you hear the startup chime, or bong if you prefer. Can you hear the drive, the fans?
More information from you will assist us trying to help you.

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.

Macbook pro will not advance beyond grey screen at beginning of boot

macbook pro will not advance beyond grey screen at beginning of boot

Try performing an SMC reset. I am having this problem also.
To perform an smc reset:
1. Shut down your Mac, leave the MagSafe charging in.
2. Push three buttons: shift + control + option and the power button. Push and release together.
3. Wait a few seconds then turn on your Mac as normal.
Hope that works out for you!

MacBook Pro will not boot

MacBook Pro will not boot. Just get grey screen. When I hold down control + R, I get blank blue screen.

Which model MacBook Pro do you have?
It's COMMAND and R that will take you to your Recovery partion, not Control and R.
If a later model, can you boot into Internet Recovery (booting whilst holding down the command, option and R keys)?
Clinton

HT203254 MacBook pro will not boot up?

My 2007 MacBook pro will not boot up. Sometimes just stops booting before password screen, but other times after that. If I get to put in my password it goes on, but I either get a blank screen or partial jumbled screen. When using boot disc and run hardware test it gives a video controller error 4VDC/1/40000003. Would that make it hang up and not fully boot? I can understand it giving blank and jumbled screens.

Means you need a new logic board. Make an appointment at an Apple store to confirm.

My Mid 2010 MacBook Pro will not boot

My Mid 2010 MacBook Pro will not boot regularly, in safe mode, in recovery mode or from original OS DVD. Is this the logic board?
I've tried resetting the SMC and pram numerous times and even tried switching out hdd's to try and do a clean install on a new hdd.
If I attempt to boot regularly or from recovery drive the grey apple logo appears for a period before the screen goes black and the power LED operates as though in 'sleep' mode. I'm unable to wake it from this state and the same applies to booting in safe mode.
When attempting to boot from the OS DVD that was originally packed with the computer it just freezes on the language select option, this occurs with the other hdd's I have attempted to use.
Any other suggestions to get it working? I fear the logic board has gone and that the repair won't be worth the money.
Thank you in advance.

Hi JRC8.8,
It sounds like you have been on the right track in trying to troubleshoot this issue. You may want to see if your MacBook Pro will boot directly to the Apple Hardware Test, as outlined in the following article:
Apple Support: Using Apple Hardware Test
http://support.apple.com/kb/ht1509
Regards,
- Brenden

My Macbook Pro will not boot up. How can I get to the time machine back up?

When I turn on my Macbook Pro, it gets to the gray screen with the Apple logo and the spinning beach ball and stays there. I use Time Machine with a Seagate external harddrive to back up my files. I at first thought recovery meant using Seagates's Replica software, so I followed the instructions, inserting the recovery CD and booting up to the C drive. The Seagate tecnical support person informed me that I was in error and that because I was using Time Machine, the Replica recovery CD would not be useful to me. Now I have two problems. I can't boot up, and I can't get the Replica CD out of the C drive. So I have several questions. How do I remove the CD? There doesn't appear to be a place to use the old paper clip method. Once I've removed the CD, how do I reinstall the OS? I don't seem to have a hard copy of Mavericks that should have come with this laptop.

historyrocks wrote:
How do I remove the CD?
Restart, hold the mouse button down as it boots, it should be ejected.
historyrocks wrote:
Once I've removed the CD, how do I reinstall the OS? I don't seem to have a hard copy of Mavericks that should have come with this laptop.
Lets take this step by step…
Once the disk is ejected see if 10.9 can boot normally.
If that fails let us know what happened.
Power off & disconnect your Time Machine disk and any other external disks just for now (so we know it is safe & not causing this issue).
Reboot & hold alt - it will take you into the 'boot picker' it will list all available boot disks. Make a note of how many disks appear and what the names are - let us know here.
You could try picking the 'recovery partition' if available. That should eventually show you a screen where you can select Disk Utility in the list of options…
In Disk Utility select the 'boot disk' – this is usually the item above 'Macintosh HD' (or whatever your boot disk is called).
Select the 'First Aid' tab
Repair any disk damage that is reported via 'verify'. Then select the 'Macintosh HD' & repair the permissions too.
Recovery mode explained…
http://support.apple.com/kb/HT4718
If you have no recovery partition you can use 'Internet recovery mode' (Command+Option+R at startup) - this downloads enough to repair & install 10.9. Try to use an ethernet connection for the internet - it can be many times faster & more stable than wifi.
Once that completes reboot, hold alt & select your main boot disk (maybe Macintosh HD) if it is available.
The recovery partition can also be used to download & install 10.9.3. However you should probably see what state the Mac's boot disk is in. It's possible that erasing & reinstalling is the only option. If you go down this route you can restore the Time Machine backup, but it's better to see if it can be fixed first.

How do I uninstall Yosemite please ? Since I upgraded my 2011 MacBook Pro will not boot up

My 2011 MacBook Pro will not boot up following my upgrade to Yosemite. How do I uninstall or downgrade back to the previous version of OS please ?

You can't downgrade or uninstall unless you first erase the drive. Try the following:
Reinstalling OS X 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 OS X: Select Reinstall OS X 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.
Also see:
Reinstall OS X Without Erasing the Drive
Choose the version you have installed now:
OS X Yosemite- 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.

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

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