Getting prohibit sign at startup

MacBook Pro is booting up slow. Getting a prohibit sign. Won't boot up.

sbbyrne wrote:
MacBook Pro is booting up slow. Getting a prohibit sign. Won't boot up.
Try starting up using Command + R and try repairing the disk with DiskUtility. Also give us the specs on your computer.
Pete

Similar Messages

Getting prohibit sign.

Mac Pro only starts up in safe boot, getting prohibit sign otherwise, I ran disk utilities and no problems found. Any suggestions?

Run Apple Hardware Test in Extended Mode at least three times, if you have any error codes take ti to your local Apple Store or AASP for repair. In Disk Utility what is the S.M.A.R.T. status showing??? If it's not Verified, then your HD is seriously damaged and probably ready for replacement.

Getting prohibitory sign at startup. Have tried everything!!!

Using early 2008 MacBook with 10.6.3. Getting prohibitory sign at startup. Repaired HD through startup disc. Still getting sign. Any last ditch suggestions?

Do you still have your Snow Leopard install CD?
If yes, you could try booting from the CD and running Disk Utility > Repair drive, but most likely you will have to install Snow Leopard over your install. While this should not harm your data it's highly advised that you backup first.
Because you can't boot into your drive, in order to do this you would need a bootable drive. You would need to install OS X on the external drive and boot from that drive. Download SuperDuper and make a clone backup.
SuperDuper! http://www.shirt-pocket.com/
You can select to use Disk Utility to erase the internal drive and install OS X. You can use migration to bring over your data from the clone backup.
If you meet the requirements and your software will run under Mavericks, you might choose this time to make the move.
Check out your software here:
App Compatibility Table
http://roaringapps.com/apps:table
The two most common app that require updates are Microsoft Office 2004 and Older versions of Adobe CS. No app that requires Rosetta like Apple Works will run under Mavericks.
OS X Mavericks: System Requirements
To install Mavericks, you need one of these Macs:
          ▪          iMac (Mid-2007 or later)
          ▪          MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
          ▪          MacBook Pro (13-inch, Mid-2009 or later),
          ▪          MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
          ▪          MacBook Air (Late 2008 or later)
          ▪          Mac mini (Early 2009 or later)
          ▪          Mac Pro (Early 2008 or later)
          ▪          Xserve (Early 2009)
Your Mac also needs:
          ▪          OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
          ▪          2 GB or more of memory
          ▪          8 GB or more of available space
Hope this helps!

My mac air died, after i reinstall from dvd drive, when i boot up again, i saw a prohibit sign showing up on the screen, then get to my logon screen. After logon, it takes very long time to load any application. pls help

my mac air died, after i reinstall from dvd drive, when i boot up again, i saw a prohibit sign showing up on the screen, then get to my logon screen. After logon, it takes very long time to load any application. pls help

OK. If you believe that.
When the disk is starting to die it can be bad for a moment and then be good for a while. If there was no problem while you were checking it of course it shows up good.
I tell you those are the signs of a disk that is about to die.
Allan

After upgrading to 10.3.1 I get error -50 on startup and 1008 when I try to sign in to the store

After upgrading to iTunes 10.3.1 I get error -50 on startup and 1008 when I try to sign in to the Store. How do I fix this?

I got the solution from another post...
use the Finder to navigate to /library/preferences/SystemConfiguration and delete NetworkInterfaces.plist ( you will be prompted for username and password), then reboot. You will get a message about new network interface found--just reset the network info.
That did it for me.

Why does my computer keep showing a flashing folder and question mark and sometimes a prohibit sign?

Lately whenever I bootup my 13in Macbook Pro (Late2011) it starts off as usualy but than the apple logo turns into a blinking folder thats has a question mark on it or a blinking prohibit sign. So confused on what to do. Please help!!

Question (?) Mark, Blinking Folder, or Gray Screen at Startup
These are related but not identical issues. Their causes are outlined in Intel-based Mac- Startup sequence and error codes, symbols. Solutions may be found in:
A flashing question mark appears when you start your Mac
Mac OS X- Gray screen appears during startup
Mac OS X- Gray screen or prohibitory sign appears during startup
In most cases the problems may be caused by one or more of these:
Problem with the computer's PRAM - See Resetting your Mac's PRAM and NVRAM.
Boot drive's directory has been corrupted - Repair with Disk Utility.
Critical system files are damaged or deleted - Reinstall OS X.
The disk drive is physically non-functional - Replace the hard drive.
Note that the information I have provided is what Apple recommends, If other users suggest different solutions than found here, then be sure what they recommend does not impact on your warranty, if any, or ability to get continuing Apple service.
Please don't start removing drives or changing cables unless you know what you are doing and have exhausted other non-invasive alternatives outlined here. If you perform any work yourself that is unapproved by Apple, then you will void any warranty you may have and lose all further Apple Support.
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.
The main difference if you are using Lion or Mountain Lion is that you must first boot from the Recovery HD. Simply boot from the Recovery HD to perform the above.
Reinstall Snow Leopard 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.
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.

Prohibitory sign on startup

Hi all,
My G5 froze this evening and I had to do a hard shutdown. Ever since then I get the prohibitory sign on startup (a no entry sign on the grey Apple boot screen).
I've followed Apple's instructions to reset pram and nvram, and replace mach-kernel, but I still can't boot from either of my internal drives, nor the CD drive.
I've tried the following:
Boot from HD1 - no entry sign
Boot from HD2 - no entry sign
Boot from Tiger DVD - no entry sign
Unplug HD drives - no entry sign
Remove 2 of 4 RAM modules - no entry sign
Unplug all peripherals, including drives, remove all but two sticks of RAM - boots from DVD
Plug back in drives and peripherals but not RAM - works fine
Shut down, install RAM - no entry sign
Now, here's the odd bit. I then took the RAM back out as it should have then allowed me to boot again but it didn't and went to the no entry sign.
Took out all peripherals, unhooked internal drives - no entry sign.
Have also removed all ram and pram battery, then started up, shutdown, put it all back, then booted again and still the no entry sign.
By the way, I've reset the PMU twice during the evening, reset PRAM and NVRAM numerous times.
Target disk mode works fine so am able to recover data, and disk utility and diskwarrior report few errors, if any.
Does this point to a major hardware failure somewhere? Can anyone help pin this down?
Many thanks,
Justin

Do you have power? Do your drives spin up when you turn on the computer? If you do then,
Try the following:
Repairing the Hard Drive and Permissions
Boot from your OS X 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 Installer menu (Utilities menu for Tiger and Leopard.) 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. Now shutdown the computer for a couple of minutes and then restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger, and 4.1 for Leopard) and/or TechTool Pro (4.6.1 for Leopard) 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.
Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo appears.
5. Wait for installer to finish loading.
Message was edited by: Kappy

Prohibitory sign on startup + wifi not working

A few days ago my 2011 MBP refused to boot and froze at a prohibitory sign on startup. I tried SMC resets, PRAM resets etc, but to no avail. Then I've managed to get it to boot a few times, usually after opening it, removing and fiddling about with the HD a little (yes, makes little sense to me too). But now it says Wifi: no hardware installed. I tried renewing the DHCP lease like someone suggested, but that just resulted in Wifi disappearing from the list of network connections...
Verify disk said the disk seems ok. Verify permissions, however, seems to freeze the system.
If I restart, it most likely boots into the prohibitory sign again.
Now I wonder, could these issues be related somehow, the prohibitory sign (points to a faulty HD, I gather) and the Wifi? Or could it be a software issue? I just want to know whether I should replace the HD and wifi or just get a new Mac.
Also, this is so rare that I have to share: these issues started on the day I was meant to hand in a project I've been working on for a couple of weeks (no backups of course, because why would my 4-yo laptop ever fail me?). But, it happened only after I delivered the project. Ha! And when it did boot again, I managed to do a full backup, including three years of unique family photos. Ha! again. A dark day at the satanic IT department, I expect.

maho76 wrote:
The HDD seems to work normally via USB, though it's rather slow. I suppose that could just be a slow USB connection in my very cheap enclosure?
Exactly, the USB2 connection is the bottle neck.
I'll see if I can find a replacement SATA cable, I hope it's just that...
Though not the cheapest alternative, but the Apple store can do this and it should not break the bank.
Ciao.

Prohibitory sign at startup / Brand new MacBook Pro 2011

Hi guys,
maybe you can give a little more info about this.
I purchased my MacBook Pro 15.4” QC i7 2.0GHz last Tuesday and right away I put an Intel SSD in. A few days later I got a 'prohibitory sign' error. I have read the support article for this.
My SSD is INTEL X25-M SATA2 SSD 160GB 2.5" RETAIL (SSDSA2MH160G2R5). After when I first got the sign I formatted my SSD (Zero out data) and installed Show Leopard from the DVD. All seemed fine, even the boot time shrank from 40-50 sec to 15. And a day later I got the 'prohibitory sign' again. So now I'm confused... The SSD is compatible with Mac. The only thing I discovered today is that a new firmware is available for the SSD. Maybe this will solve the issue?! Note that this sign appears randomly. After when I got the sign I forced shut down and after turning it on again the startup went as it should... So most of the time everything works fine, but sometimes I get the sign.
Have any of you experienced something like this using Intel SSDs?
Thank you.

i have had my macbook stolen before
the apple store people will say you cannot do anything
you have to call tech support, its the tech support people that will flag your serial number on your laptop
unfortunately with you laptop only being a few minutes new, and they probably stole the whole thing with box and components you have a lower chance of ever retrieving it,
i feel for you man, i know what it is like to get your mac stolen

When i open iphoto i see my photo's for 1 second and then they are gone .The photo's are still there but i can see them only on the bottom or top of my screen when i try to open them i get a sign that it is not possible.Can somebody please help me?

when i open iphoto i see my photo's for 1 second and then they are gone .The photo's are still there but i can see them only on the bottom or top of my screen when i try to open them i get a sign that it is not possible.Can somebody please help me?

Have you upgraded to iPhoto 9.6 for compatibility with Yosemite? If not, try that first.
It looks like iPhoto has lost the connection between the thumbnails and the original image files.
This can be caused by a corrupted iPhoto library, or the originals have been deleted or moved.
Try first to rebuild your iPhoto Library:
If you do not have a current backup of the iPhoto library, make a copy of the library, but do not overwrite any previous backup.
Launch iPhoto with the ⌥⌘-key combination (option-command) held down.
Select "rebuild" from the first aid panel. This may take a while for a large library.
Can you now see your photos again?
If not, rebuild the library with iPhoto Library manager as described by Old Toad: Re: iphoto crashed

Why can't I get iCloud Sign In to go away?

How do I get iCloud Sign In to go away. I type in Apple Id over and over and it does not recognize. It also won't let me connect to the Internet. I tried resetting all settings and I have rebooted. What else can I do?

Read the instructions in this discussion by gail from maine
https://discussions.apple.com/thread/5689317?start=0&tstart=0
The OP in that discussion had circumstances that were similar to yours. Maybe her response will help you sort out your problem.

When synching my IPhone 3Gs I now get a sign "Attempting to copy to Disk failed. The required disk cannot be found." This is after synching a new Iphone 4s.. Help!!

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This is after synching a new Iphone 4s and having received some help from Apple Support who assisted with some setting
changes. Unfortunately this was over a protracted period of time and I cannot recall what was changed. Apparently my 3Gs is out of
its warranty and so they cannot help me unless I pay £25....
Can anyone help??
Johnm2429

Well, attempted again today and now my iTunes locks up whenever I select a song! Also, my Volume Mixer on my Windows 7 will not open. Just terrific. Where's my MacBook???????????????

In numbers, how do I get a $ sign in a cell?

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It's in Format > Cell. Choose Currency and then US Dollar.
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When I select "Convert" using the Adobe PDF conversion - I get "Error signing in"

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I create a mobile game. How to get the signing key? Is the certificate is payable? Sorry if the topic is in the wrong section.

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Getting prohibit sign at startup

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