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.

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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

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

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.

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!!

When attempting to synch 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 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?

In numbers, how do I get a $ sign into a cell? It should be easy but not for me.

It's in Format > Cell. Choose Currency and then US Dollar.
SG

When I select "Convert" using the Adobe PDF conversion - I get "Error signing in"

When I select "Convert" using the Adobe PDF conversion - I get "Error signing in"

You need the CreatePDF forum

I create a mobile game. How to get the signing key?

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.

You need to be an iOS/Mac OS X developer.
https://developer.apple.com/devcenter/

Sign in told my firefox out of date did try to do upgrade but could not need help to get my sign in workin email

sign in told my firefox is out of date. did try to do the upgrade but could not do
need help to get my sign in working

Kathleen Beal/funstarling please respond in https://support.mozilla.org/en-US/questions/982953

I am getting a Sign In to iCloud and I can't get rid of it...It won't cancel...

I am getting a Sign In to iCloud and I can't get rid of it...It won't cancel...any ideas?

Did you trying signing in?

I just bought and installed mountain lion, and I can't get to sign in to hotmail.Can I get some help please. Thanks.

I just bought and installed mountain lion, and I can't get to sign in to hotmail after several trials. I need help please. Thanks.

so its in a forum, which I didn't stumble upon because it wasn't anywhere in the adobe troubleshooting steps for Windows 8 that automatically came up for me when I clicked that I couldn't see the test flash movie on their site. I guess if I spent another half a day googling I might have found it.
BTW, unchecking Active X filtering in IE10, was NOT the fix. I had to go into the security tab, and change the custom active X setting I listed above. So this link you provided which mentions unchecking Active X filtering was not the fix that worked in my scenario.

Cannot get past "Sign In Required" page

Installed Elements 12 and when trying to open either Photoshop Elements OR Premier Elements I get the Sign In Required Page, enter my Adboe ID and password and then......nothing
The Organiser will run but when I try to set up my Adobe Revel account I enter my adobe id and password and then....nothing

Hi,
Can you please share following logs @ [email protected]
Go to temp(Start -> Run and type %temp%) and attach <<oobelib.log, PDApp.log,amt3.log>>
-Shikha

I have been trying for three days to try and get this working , and tried a few of the forum suggestions already and this is just to try them ... so glad i haven't pais anything yet . i get the signed out loop no matter what i try

i have been trying for three days to try and get this working , and tried a few of the forum suggestions already and this is just to try them ... so glad i haven't pais anything yet . i get the signed out loop no matter what i try

What have you been trying for three days to try and get this working???
Supply pertinent information for quicker answers
The more information you supply about your situation, the better equipped other community members will be to answer. Consider including the following in your question:
Adobe product and version number
Operating system and version number
The full text of any error message(s)
What you were doing when the problem occurred
Screenshots of the problem
Computer hardware, such as CPU; GPU; amount of RAM; etc.

Getting prohibit sign.

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