Upgrading to yosemite the computer 27 iMac froze and now all I can get is a white screen

Upgrading to yosemite the computer, 27 iMac froze and now all I can get is a white screen
How can I move forward or revert back to mavericks?

Look at this support article:
http://support.apple.com/kb/ts2570
Ciao.

Similar Messages

I've tried to set up a new user on a mac book pro and i restarted it to create the new account but now all i can get is a white screen with the apple logo and the loading symbol what can i do ?

i've tried to set up a new user on a mac book pro and i restarted it to create the new account but now all i can get is a white screen with the apple logo and the loading symbol what can i do ?

Look at this support article:
http://support.apple.com/kb/ts2570
Ciao.

I was trying to transfer iTunes from my iPhone 4 to my new Mac Pro and now all i can get on my phone is the iTunes logo and a usb cord pointing to plug into it. my phone wont do anything else? Help if you can?

I was trying to transfer itunes to my macpro from my iphone 4 and the phone froze up with the itunes logo and a usb cord looking like its suppose to plug into the itunes.. Now my phone wont go past that screen and i cant use the phone at all... Help if you can?

Contacts are designed to be synced to a supported application on the computer or a cloud service.
Pictures taken with the device are designed to regularly be copied off the device to a computer as would be done with any digital camera.
If you have failed to use the device as designed it may be too late to recovery anything.
Is the device regularly backed up to a computer via iTunes? If so, the most recent backup (when restored to a replacement iOS device) should contain all contacts and pictures as of when the backup was created.

I have installed yosemitie but now all i can see is a white screen?

i have installed on an apple mac 21 inch.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

My computer froze so I restarted it and now all I can get is a flashing folder with a question mark, what is happening?

I have a MacBook pro and I need help getting it restarted. It flashes a folder with a question mark in it what is wrong with it, any suggestions

You either need to run a disk repair program on the hard disk, or reinstall the OS on that drive. Both of there require a recovery partition or a Mac OS X install disk.
(69883)

HT201210 i have a ipone4s and am trying to update to the latest version. There has been a error and now all i can get is a iTunes logo with a connection arrrow pointing up. i cannot get the phone to do any thing.

I am trying to updated my Iphone 4s and there is a erroe while updating. My phone has now got a iTunes icon with a arrow below it and a picture of a connectione cable below that. I cannot get the phone to respond to any thing.

Here's a few things to check
1. Make sure you are using the original usb cable provided by apple
2. Try re-installing iTunes preferrably uninstall then install a new version
3. Try different usb ports
4. If all goes wrong, install itunes on a different computer and update it on the other computer, then you can always plug it up again on yours and restore your information

I just upgraded to the new mobile me calendar and now all my calendar entries on iCal have been erased. As I type this the calendar entries are still on the mobile me and iphone calendars. How do I restore the calendar entries to iCal?

I just upgraded to the new mobile me calendar and now all my calendar entries on iCal have been erased. As I type this the calendar entries are still on the mobile me and iphone calendars. How do I restore the calendar entries to iCal?

Please always post your System details when you have a query. The upgrade to the new MobileMe calendar produces different results, and different problems, with different versions of OSX.
Snow Leopard: during the upgrade process your iCal calendars should be moved to MobileMe (this can take some time and you have to wait for it to happen). Once done, your iCal reads the calendars from MobileMe so any changes made in either place will be visible immediately. If this has not happened then this Apple Tech Note provides instructions:
http://support.apple.com/kb/TS3397
Leopard: when the upgrade is completed iCal on Leopard will not be able to see the MobileMe calendars until an additional process is carried out, detailed in this Apple Tech Note:
http://support.apple.com/kb/HT4330
Tiger: iCal on Tiger cannot read the MobileMe calendars, period. The only workaround is to upgrade to Leopard, or Snow Leopard if possible (Intel Mac required).

How do I get an iPod touch to turn on other than the normal way. It has been dropped and all I can get is a blank screen. Have tried holding the HOME button down for 30 sec. but that didn't work.

How does one get an iPod nano to turn on other than the "normal" way? This one has been dropped and all I can get is a blank screen. I have tried holding down the HOME button to restart it but no go. When I connect it to my computer, I am told to enter the PASSCODE which I cannot do as there is no touchpad.

David ..
Your topic refers to an iPod touch
Then you say: How does one get an iPod nano to turn on ......
If it's an iPod touch, try a reset.
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
If that doesn't help, whether it's an iPod nano or touch, it probably needs service > Apple - Support - Service Answer Center

My ipod just froze and now all i see is a white screen

i dont know what to do my ipod just froze and now all i see is a white screen.

Try:
iOS: Not responding or does not turn on
If not successful and you can't turn the iPod fully off, let the battery fully drain. After charging for at least an hour, try the above again.
- If still not successfully that indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.

I was editing vacation photos in aperture 3 all of a sudden the thumbnail disappeared and now all i have is a vertical white line and an orange flag... how do i get my photo back? thanks

i was editing vacation photos in aperture 3 all of a sudden the thumbnail disappeared and now all i have is a vertical white line and an orange flag... how do i get my photo back? thanks

     Hi Frank.
     I have just had jb Atlanta's problem while adjusting the contrast on a photo. I was creating a slideshow at the time. After a lot of reading up I was about to give up when I tried restoring the file to its original settings as you suggested. Bingo!
     However, that would only work for me, if I restored the settings while in the slideshow. All data had 'disappeared' when I attempted to open the photo in its original project folder.
     Hope this is of help. Many thanks.

I did the software update ios 7 and now i cant hardly get wifi and my calls are being dropped.

I did the software update ios 7 and now i cant hardly get wifi and my calls are being dropped.Can anyone help me?

I updated my ipad to the ios7.4 and my wifi connection just wouldn't work any longer.

I got new phone last week and cannot access my music now. My mrs was using the emails adress but different password and now all I can access is the kids games

i got a new phone last week and now I can't access my music. My mrs was using the same email address but different password, and now all I can access is the kids games

If by 'My mrs was using the same email address but different password' you are referring to iTunes accounts, then the primary email address on an iTunes account has to be unique - there can't be multiple accounts with the same email address.
And the music was purchased from iTunes, it's not music that was copied from CDs or bought from other sites ?

Hi guys i have an macbook 13 late 2007 and does not work when i start it up all u can see is blank white screen and after that its keep bepping high peech tone 3 times i was thinking the hard drive but im not too sure please guys help.

Hi guys i have an macbook 13 late 2007 and does not work when i start it up all u can see is blank white screen and after that its keep bepping high peech tone 3 times i was thinking the hard drive but im not too sure please guys help.

Try to reset the PRAM first then go from there.
http://support.apple.com/kb/HT1379

My Ipod went dead during upgrading to Ios 6 and now it switches from apple logo to white screen and won't recognize to the computer?

Basicall I was upgrading to iOs 6 and during the middle of it my ipod went dead and now the computer wont recongize it and when I restart it it switches from apple logo and white screen?

Have you tried doing a DFU restore? Here's how: http://appletoolbox.com/2010/07/using-dfu-restore-to-solve-iphone-problems/

I downloaded the latest version of iTunes and now ALL of my songs sounf d like skipping records. How do I get rid of this or completely remove the new version that I downloaded???

I booted up my computer and opened up my usual shortcuts. I got a message from iTunes that a new version was available and would I like to download it. I clicked on "yes". It took over 1/2 hour to download and now ALL of my songs sound like a skipping record or like they are tripping over themselves. I uninstalled the ITunes and tried reinstalling my old version. I've tried EVERYTHING I could think of to get my old version back but everytime I go through the download process I get a message saying that - the file "iTunes Library.itl "cannot be read because it was created by a newer version of iTunes. I was finally able to download a version that will open but it has the same "skipping" problem. How do I stop/fix this or COMPLETELY get rid of this version of iTunes and re-download what I had??? I'm REALLY distressed.      Jim

Usually, the exclamation mark tells you that the song was not where the program expected to find it. It may also mean that there was an error with the file itself.
   If you click on the exclamation mark, it may give you a reason. You can also double click the file to make it play. If the file is not found, it will tell you. Just follow the prompts to look for the song again. It will ask you if you want to look for the other missing songs in the same folder. You can do it, but unfortunately, the last few updates have made the program blind to the songs that are there and you sometimes have to do the same process for each song.
   If neither of these help, I would suggest starting from scratch and reinstalling iTunes. I have had to do that before. Do your best to back up the library and such first.
   Sometimes a computer will rename a hard disk (Windows) and all the songs on that disk will be gone to iTunes because it will think it's looking in the right place. It can't recognize that the hard disk or partition has been renamed.
I know that this is a podcast, but the principle is the same. A dialogue box should pop up to tell you just what the problem is.
   I hope this helps!

Upgrading to yosemite the computer 27 iMac froze and now all I can get is a white screen

Similar Messages

Maybe you are looking for