Upgraded to Yosemite but now have a blank screen with only a prohibitory sign. How do I clear this?

I have upgraded my MacPro to Yosemite last night which took about 5 hours before it completed the installation. All was working well. Shut down the computer but on turning the computer back on all I get is a prohibitory sign. Does anyone know how t

If you power cycle the Mac, and hold the Alt key, what choices do you see?
What year/model is the Mac?

Similar Messages

Upgraded to premium but now just get blank screen - nothing happens or liads up

I upgraded last night to premium student, but this morning my Spotify now doesn't work. I'm on a windows phone, Nokia Lumia, always worked fine before. I have uninstalled, reinstalled and it will work the first time upon reinstalling but if I come out of Spotify and try to go back in all I get is a blank black screen, no logo or any loading at all. Within 24hrs of paying I've lost even the free service...not good.

Take a look at these 2 articles: Startup issues
http://support.apple.com/kb/TS1417
Gray screen at startup
http://support.apple.com/kb/TS2570

I dropped my iPOD and I just have a gray screen with the apple picture. How can I fix this

Please help. I am unable to access my iPOD Classic.

What have you tried so far in terms of troubleshooting? Have you tried resetting the iPod by pressing and holding both the Select/Center and Menu buttons together long enough for the Apple logo to appear?
B-rock

I am running 10.7.5 on an imac and I want to upgrade to Yosemite but I have no app store on my computer. Is there a way I can get the app store on my imac?

I am running 10.7.5 on an imac and I want to upgrade to Yosemite but I have no app store on my computer. Is there a way I can get the app store on my imac?

If you don't have it then you will have to reinstall Lion:
Reinstall Lion, Mountain Lion, Mavericks or Yosemite 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.
Reinstall Lion, Mountain Lion, Mavericks, or Yosemite
OS X Yosemite- Reinstall OS X
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
     Note: You will need an active Internet connection. I suggest using Ethernet
                 if possible because it isthree times faster than wireless.
Then you can download and install Yosemite if your computer meets the system requirements:
Upgrading to Yosemite
You can upgrade to Yosemite from Lion or directly from Snow Leopard. Yosemite can be downloaded from the Mac App Store for FREE.
Upgrading to Yosemite
To upgrade to Yosemite you must have Snow Leopard 10.6.8 or Lion installed. Download Yosemite from the App Store. Sign in using your Apple ID. Yosemite is free. The file is quite large, over 5 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
    OS X Mavericks/Yosemite - System Requirements
    Macs that can be upgraded to OS X Yosemite
         1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model Identifier 5,1 or later
         3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later
         4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
         5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
         6. Mac Pro (Early 2008 or newer) - Model Identifier 3,1 or later
         7. Xserve (Early 2009) - Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
     Are my applications compatible?
         See App Compatibility Table - RoaringApps.

While updating Ipod we now have a blank screen and when connecting to itunes the ipod is not showing under devices

While updating ipod touch we now have a blank screen. I have updated itunes but am unable to sync because the ipod does not show under devices. I have tried shuttng down and restarting but only have a blank screen or ap0ple logo. Sometimes the screen shows connect to itunes but that has been it.

I have the same problem, after upgrading my itouch to iOS6, it doesNOT respond to anything, apple logo stays on the screen all the time and does NOTHING! restore does not work either.... i hope we can get an answer from someone soon... apple support did not have an asnwer.

I have tried to restore my old iPhone 3, but when i tried the itunes logo and a pic of a USB cable have come up on my phone and now i cant do anything with my phone.Any ideas how i can fix this? I can make/receive call. iPhone 3GS, iOS 3.1.2. Thanks

I have tried to restore my old iPhone 3, but when i tried the itunes logo and a pic of a USB cable have come up on my phone and now i cant do anything with my phone.Any ideas how i can fix this? I can make/receive call. iPhone 3GS(Ireally don't remember if it's a 3G or 3GS), iOS 3.1.2. Thanks for your help

please help me!!!

HT204053 i RECENTLY PURCHASED ANOTHER IPHONE. MY INTERNET IS NOT WORKING. I JUST CREATED AN APPLE ID. WHAT'S NEXT? I NOW HAVE TWO DIFFERENT ACCOUNTS WITH DIFFERENT USER NAMES. HOW CAN I USE ONLY ONE ACCOUNT FOR ITUNES, ICLOUD APPLE ID ETC???

I RECENTLY PURCHASED ANOTHER IPHONE. MY INTERNET IS NOT WORKING. I JUST CREATED AN APPLE ID. WHAT'S NEXT? I NOW HAVE TWO DIFFERENT ACCOUNTS WITH DIFFERENT USER NAMES. HOW CAN I USE ONLY ONE ACCOUNT FOR ITUNES, ICLOUD APPLE ID ETC???

Welcome to the Apple community.
iTunes and iCloud and different accounts, you will need to delete both accounts from your device before adding the new details in their place.
For iCloud go to settings > iCloud, scroll down and hit the delete button. You can then sign back in using your correct details. For iTunes go to settings >store, tap your account ID and then sign out, you can then sign back in using your correct Apple ID.

I inadvertantly dropped my iphone 3 and now have a white screen with green vertical lines to the right. It won't sync with itunes due to an error. What can I do?

I inadvertantly dropped my iphone 3 and now have a white screen with green vertical lines to the right of the screen. It won't sync with itunes due to an error. What can I do?

Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Try each of these in order until the issue is resolved.
If it does not resolve the issue, the device is permanently damaged and will require replacement.

HT5129 I keep getting the message MobileMe has been discontinued - iPhoto willmove albums you have published to MobileMe Gallery. . . but I have not knowingly published any photos to MobileMe. How can I get this message to stop. It's getting annoying.

I keep getting the message MobileMe has been discontinued - iPhoto willmove albums you have published to MobileMe Gallery. . . but I have not knowingly published any photos to MobileMe. How can I get this message to stop. It's getting annoying.
Also, how can I remove duplicate photos in an album without doing it manually?
Thanks!

When the prompt pops up next time you start iPhoto select Learn more. Then click on iPhoto preferences and select the Accounts tab. Delete your MM account and the quit iPhoto. Next time you open iPhoto the problem should be eliminated.

I have a blank screen with the spining circle. doesn't respond to anything

i have a i touch runing newest software 10.5? i have a blank screen with the spining circle. doesn't respond to anything, ie...holding the on off switch
or the home button for 10 seconds

Hi,
If the site has been bookmarked, you can try to check if '''Load this bookmark in the sidebar''' has been enabled (tick) in the [https://support.mozilla.org/en-US/kb/how-do-i-use-bookmarks?s=bookmarks&r=0&e=sph&as=s Bookmarks Library]: '''Bookmarks''' > '''Show All Bookmarks''', search for the site on the top right search box, select the site and click on the arrow beside '''More''' on the bottom.

I turned off my computer while installing something and now I only get the start-up screen with the apple logo. How do I fix this?

I turned off my computer while installing something and now I only get the start-up screen with the apple logo. How do I fix this?

Reinstall OS X:
Reinstall OS X without erasing the drive
Do the following:
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 the Combo Updater for the version you prefer from support.apple.com/downloads/.
Reinstalling 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: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

My iphone 4 is from telus can, and i got the sim to activate it, but i want to use it with my att account. how can i do this?

hi my iphone 4 is from telus can, and i got the sim to activate it, but i want to use it with my att account. how can i do this?

contact telus as to how you get it unlocked

Can't open a file,just goes to a blank screen then back to desk top, how do I fix this?

Can't open a file,just goes to a blank screen then back to desk top, how do I fix this?

What system?
What version of PageMaker?
Can you open the PageMaker app ok?
If so, what happens if you then use File > Open? (Not double click)

I want to upgrade to Yosemite but I have questions

I have never upgraded my OS on my MAC, it's always worked fine, and still does. I'm still using OSX 10.6.8 but i'm thinking about upgrading to Yosemite. I have Word, Excel & Powerpoint, all 2008. I also Have Adobe Bridge CS4 and Photoshop Elements 8.0 I'm wondering if anyone knows if those programs will still work with the new OS, or am i about to be in the market for new software too?
Also, this Mac is pre-Cloud, will upgrading to Yosemite, make my Mac now a part of the cloud?
Any help is appreciated
TY!

I'm running Office 2008 on my 2011 iMac with 8 GB of memory and it runs fine. I've got PSE 10 which also runs. If you need to upgrade your PSE then the latest version would be the way to go.
PS CS4 should work with Yosemite as I'm running CS3 which works fine. However, you'll need to download and install Java from this Apple webpage: Java for OS X 2014-001 for both PS and PSE to run.
Definitely go to the Roaring Apps website and check out all of your 3rd party apps there before making the jump to see which will need to be upgraded.

Help! I tried to power off my ipod touch 3gen-now I have a blank screen with a loading symbol.

I tried to power off my ipod touch. The screen showed the "slide to power off" button and "cancel". I slid the power off. Since then(30 minutes) I've had a blank screen with the loading symbol on it(moving loading symbol). What do I do?

Try a hard reset,
Basic troubleshooting steps.
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD  120G Vertex 3 SSD Boot HD 

Upgraded to Yosemite but now have a blank screen with only a prohibitory sign. How do I clear this?

Similar Messages

Maybe you are looking for