Update lion after restart white screen, no logo

I have a 2 weeks old:
MacBook Pro 15", Intel Core i7 Quad 2.2 GHz
Yesterday i tried to update Lion with the update apple released that day. It downloaded the update and it asked me to restart the computer. After hitting the restartbutton my screen turned white. The only thing left was the mouse arrow.
I waited at least an hour but nothing happend. I tried to restart my computer pressing the on/off button. It tried to restart but got stuck at the startupscreen with the apple logo. Today i had to reboot my computer and installed lion again. Finally i got back on my desktop. But the software update still asked me to instal the new macosx. So i tried again. And now i have this white screen again.
What can i do to fix this?

i called apple today and i got this problem fixed
I was not able to restart my computer so I had to hold down the alt key when i turned on my computer. Than these 2 harddrives appeard and i had to choose "recovery harddrive"
In the next step i could choose in a menu to reinstall os lion. So i did.. That took almost 2 hours.
Ik finally got back in my computer.
In the menu "system updates" i still got the announcement of a new Mac OSX update. But also 4 other updates.
• lion recovery update
• update remote desktop
• itunes
• something with raw files
The lady on the phone told me to seperately install these updates and that did the trick.
There seemed to be a conflict between those updates. I dont know why. But she told me that i had to install the small updates first and the recovery update as 4th and as last the mac osx update.
So maybe if you reboot your computer with the alt key and try to install lion again, and than install the updates seperately it will work. And the most important thing.. Your files will still be on your computer. You wont lose anything by doing this.

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On boot up, just white screen with logo and windmill. Forever! Can't get out.

On boot up, just white screen with logo and windmill. Forever! Can't get out.

Backup in case your disk is failing. (Post back if you need instructions on how to do that w/o booting OS X.)
Start up in Safe Mode; http://support.apple.com/kb/PH14204?viewlocale=en_US
If it boots reliably in Safe Mode then it is probably a software issue. Post back for more instructions.
Reset PRAM: http://support.apple.com/kb/PH4405
Boot in Recovery Mode. (Hold down the Command (⌘) and R keys as your computer restarts.) Run Disk Utility. Click on the upper left system disk icon. Does S.M.A.R.T. report “Verified”? If not the disk is failing and will need to be replaced. Click on the icon underneath and indented to the right, usually called “Macintosh HD”. Repair Disk. It should finish normally with a green OK message. If it does not try to repair it again.
If it will not finish with the green OK message then use Disk Utility to erase the drive and then reinstall OS X. (Be sure you have a backup before erasing the disk. Post back if you need instructions on how to do that.)
If it repaired all errors and is still not booting normally, reinstall OS X.
If it is still sick after all these steps then the disk probably needs to be replaced or it could be a disk cable. You replace these inexpensively and fairly easily yourself or take it to an Apple store for them to do it for you at a higher cost. If it is still under warranty or AppleCare have Apple do it for you for free. You may want to have Apple check the health of the system and disk before repairing it yourself. Post back if you need instructions on replacing the disk and/or testing the disk cable.

White screen no logo SOMETIMES!!

so ive read over a hundred white screen problems none are like mine!
mainly the problem occurs first time during the day i turn on my macbook 13" aluminum mac os x 10.5.8. It gives me a white screen no logo no spinning wheel . disconnecting the power supply and battery pressing the on button for 10 secs then connecting everything again and turning on the macbook usually fixes the problem... or pressing fn cmd L+ P (got this of a forum somewhere)...usualy this problem doesnt take place whenever i turn on the macbook again during the day just the first time
a couple of times it went past the logo and spinning wheel but hangs when it reaches the desktop
a couple of times it turned on to a black screen (no boing sound at the beginning)
note that it works PERECTLY once i get past the white screen problem
once it was working perfectly but it couldnt find my camera (isight) but disconnecting the battery and stuff i said above fixed it
i did a disk utility check and repair from the OS cd >> says everything appears to be ok
i did a hard ware test and extended test from the cd >> says no problems found
so WTH!!!!
i just wanna know if this seems to be a software or hardware prblem... and if i can fix it myself?
im freaking out please help!!
please not i rarely put my macbook to sleep usually i switch it on/off
any information is highly appreciated!

okay so same problem again after the macbooks been off over night im not shutting it off anymore after tonite just wanted to check the console msgs) again after forcing shutdown then turning it on again it works just fine :S
so here are all the msgs since i turned it on the first time, forced shut, turned it on again then opened up the console (sorry again i dunno wat msgs to choose so ill just paste all of them..maybe u could find something that makes sense)
Jan 7 08:54:27 localhost com.apple.launchctl.System[2]: launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
Jan 7 08:54:27 localhost com.apple.launchd[1] (com.apple.RemoteDesktop.PrivilegeProxy): Unknown key for boolean: EnableTransactions
Jan 7 08:54:27 localhost com.apple.launchd[1] (com.apple.usbmuxd): Unknown key for boolean: EnableTransactions
Jan 7 08:54:27 localhost com.apple.launchd[1] (org.cups.cupsd): Unknown key: SHAuthorizationRight
Jan 7 08:54:27 localhost com.apple.launchd[1] (org.x.privileged_startx): Unknown key for boolean: EnableTransactions
Jan 7 08:54:28 localhost kernel[0]: npvhash=4095
Jan 7 08:54:28 localhost kextd[10]: 429 cached, 0 uncached personalities to catalog
Jan 7 08:54:28 localhost kernel[0]: hi mem tramps at 0xffe00000
Jan 7 08:54:28 localhost kernel[0]: PAE enabled
Jan 7 08:54:28 localhost kernel[0]: 64 bit mode enabled
Jan 7 08:54:28 localhost kernel[0]: Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
Jan 7 08:54:28 localhost kernel[0]: standard timeslicing quantum is 10000 us
Jan 7 08:54:28 localhost kernel[0]: vmpagebootstrap: 445530 free pages and 13222 wired pages
Jan 7 08:54:28 localhost kernel[0]: migtable_maxdispl = 79
Jan 7 08:54:28 localhost kernel[0]: 102 prelinked modules
Jan 7 08:54:28 localhost kernel[0]: AppleACPICPU: ProcessorApicId=0 LocalApicId=0 Enabled
Jan 7 08:54:28 localhost kernel[0]: AppleACPICPU: ProcessorApicId=1 LocalApicId=1 Enabled
Jan 7 08:54:28 localhost kernel[0]: Loading security extension com.apple.security.TMSafetyNet
Jan 7 08:54:28 localhost kernel[0]: calling mpopolicyinit for TMSafetyNet
Jan 7 08:54:28 localhost kernel[0]: Security policy loaded: Safety net for Time Machine (TMSafetyNet)
Jan 7 08:54:28 localhost kernel[0]: Loading security extension com.apple.nke.applicationfirewall
Jan 7 08:54:28 localhost kernel[0]: Loading security extension com.apple.security.seatbelt
Jan 7 08:54:28 localhost kernel[0]: calling mpopolicyinit for mb
Jan 7 08:54:28 localhost kernel[0]: Seatbelt MACF policy initialized
Jan 7 08:54:28 localhost kernel[0]: Security policy loaded: Seatbelt Policy (mb)
Jan 7 08:54:28 localhost kernel[0]: Copyright (c) 1982, 1986, 1989, 1991, 1993
Jan 7 08:54:29 localhost kernel[0]: The Regents of the University of California. All rights reserved.
Jan 7 08:54:29 localhost kernel[0]: MAC Framework successfully initialized
Jan 7 08:54:29 localhost kernel[0]: using 9175 buffer headers and 4096 cluster IO buffer headers
Jan 7 08:54:29 localhost kernel[0]: IOAPIC: Version 0x11 Vectors 64:87
Jan 7 08:54:29 localhost kernel[0]: ACPI: System State [S0 S3 S4 S5] (S3)
Jan 7 08:54:29 localhost kernel[0]: mbinit: done
Jan 7 08:54:29 localhost kernel[0]: Security auditing service present
Jan 7 08:54:29 localhost kernel[0]: BSM auditing present
Jan 7 08:54:29 localhost kernel[0]: rooting via boot-uuid from /chosen: CBA1579B-DEBC-372E-BD51-03883A28ECF7
Jan 7 08:54:29 localhost kernel[0]: Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
Jan 7 08:54:29 localhost kernel[0]: wl0: Broadcom BCM432b 802.11 Wireless Controller
Jan 7 08:54:29 localhost kernel[0]: 5.10.91.21
Jan 7 08:54:29 localhost kernel[0]: Got boot device = IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/SATA@B/AppleMCP79AHCI/PR T0@0/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice/IOBlockStorageD river/FUJITSU MHZ2160BH FFS G1 Media/IOGUIDPartitionScheme/Customer@2
Jan 7 08:54:29 localhost kernel[0]: BSD root: disk0s2, major 14, minor 2
Jan 7 08:54:29 localhost kernel[0]: Jettisoning kernel linker.
Jan 7 08:54:29 localhost kernel[0]: Resetting IOCatalogue.
Jan 7 08:54:29 localhost kernel[0]: IGPU: family specific matching fails
Jan 7 08:54:29 localhost kernel[0]: Matching service count = 1
Jan 7 08:54:29 localhost kernel[0]: Matching service count = 2
Jan 7 08:54:29: --- last message repeated 4 times ---
Jan 7 08:54:29 localhost kernel[0]: Matching service count = 3
Jan 7 08:54:29 localhost kernel[0]: Previous Shutdown Cause: 3
Jan 7 08:54:29 localhost kernel[0]: AppleIntelCPUPowerManagement: initialization complete
Jan 7 08:54:29 localhost kernel[0]: NVDANV50HAL loaded and registered.
Jan 7 08:54:29 localhost kernel[0]: AppleTyMCEDriver::probe(MacBook5,1)
Jan 7 08:54:29 localhost kernel[0]: AppleTyMCEDriver::probe fails
Jan 7 08:54:30 localhost kernel[0]: IGPU: family specific matching fails
Jan 7 08:54:30: --- last message repeated 2 times ---
Jan 7 08:54:30 localhost kernel[0]: Matching service count = 0
Jan 7 08:54:30 localhost kernel[0]: [HCIController][configurePM] power parent ready after 1 tries
Jan 7 08:54:32 localhost bootlog[36]: BOOT_TIME: 1262847264 0
Jan 7 08:54:32 localhost rpc.statd[18]: statd.notify - no notifications needed
Jan 7 08:54:33 localhost DirectoryService[32]: Launched version 5.7 (v514.25)
Jan 7 08:54:34 localhost fseventsd[27]: bumping event counter to: 0x3499f99 (current 0x0) from log file '0000000003492b12'
Jan 7 08:54:34 localhost kernel[0]: NVEthernet: Ethernet address 00:23:32:ce:41:ca
Jan 7 08:54:34 localhost kernel[0]: AirPort_Brcm43xx: Ethernet address 00:23:6c:84:5f:f7
Jan 7 08:54:34 localhost blued[45]: Apple Bluetooth daemon started.
Jan 7 08:54:34 localhost /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[23]: Login Window Application Started -- Threaded auth
Jan 7 08:54:36 localhost com.paceap.pacesupport[39]: kextload: extension /System/Library/Extensions/PACESupportFamily.kext/Contents/PlugIns/PACESupportL eopard.kext is already loaded
Jan 7 08:54:37 localhost mDNSResponder mDNSResponder-176.3 (Jun 17 2009 18:57:49)[22]: starting
Jan 7 08:54:37 localhost com.apple.usbmuxd[14]: usbmuxd-176 built for iTunesNineDot on Sep 24 2009 at 16:11:05, running 32 bit
Jan 7 08:54:37 localhost kernel[0]: NVEthernet::setLinkStatus - Valid but not Active
Jan 7 08:54:37 localhost kernel[0]: NVEthernet::mediaChanged - Link is down
Jan 7 08:54:37 localhost kernel[0]: NVEthernet::setLinkStatus - Valid but not Active
Jan 7 08:54:38 localhost kernel[0]: AirPort: Link Down on en1
Jan 7 08:54:38 heba-el-kests-macbook configd[34]: setting hostname to "heba-el-kests-macbook.local"
Jan 7 08:54:38 heba-el-kests-macbook /usr/sbin/ocspd[61]: starting
Jan 7 08:54:40 heba-el-kests-macbook kernel[0]: en1: 802.11d country code set to 'FR'.
Jan 7 08:54:40 heba-el-kests-macbook kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 5 6 7 8 9 10 11 12 13 1 2 3 4 5 6 7 8 9 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 40 48 56 64 104 112 120 128 136 36 44 52 60 100
Jan 7 08:54:46 heba-el-kests-macbook kextd[10]: writing kernel link data to /var/run/mach.sym
Jan 7 08:54:47 heba-el-kests-macbook com.apple.SystemStarter[16]: Starting Aladdin USB daemon
Jan 7 08:54:47 heba-el-kests-macbook com.apple.SystemStarter[16]: PACESupport - launchd already started us
Jan 7 08:54:47 heba-el-kests-macbook kernel[0]: Auth result for: 00:17:79:30:6c:db MAC AUTH succeeded
Jan 7 08:54:47 heba-el-kests-macbook com.apple.SystemStarter[16]: Starting Qmaster services
Jan 7 08:54:47 heba-el-kests-macbook kernel[0]: AirPort: Link Up on en1
Jan 7 08:54:49 heba-el-kests-macbook loginwindow[23]: Login Window Started Security Agent
Jan 7 08:54:49 heba-el-kests-macbook authorizationhost[85]: MechanismInvoke 0x125980 retainCount 2
Jan 7 08:54:49 heba-el-kests-macbook SecurityAgent[86]: MechanismInvoke 0x101600 retainCount 1
Jan 7 08:54:49 heba-el-kests-macbook SecurityAgent[86]: MechanismDestroy 0x101600 retainCount 1
Jan 7 08:54:49 heba-el-kests-macbook loginwindow[23]: Login Window - Returned from Security Agent
Jan 7 08:54:49 heba-el-kests-macbook authorizationhost[85]: MechanismDestroy 0x125980 retainCount 2
Jan 7 08:54:49 heba-el-kests-macbook loginwindow[23]: USER_PROCESS: 23 console
Jan 7 08:54:49 heba-el-kests-macbook com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[82]): Exited: Terminated
Jan 7 08:54:49 heba-el-kests-macbook com.apple.launchd[65] (com.apple.AirPortBaseStationAgent): Unknown key for boolean: EnableTransactions
Jan 7 08:54:49 heba-el-kests-macbook com.apple.launchd[65] (org.x.startx): Unknown key for boolean: EnableTransactions
Jan 7 08:54:50 heba-el-kests-macbook com.apple.FolderActions.enabled[88]: launchctl: Error unloading: com.apple.FolderActions.folders
Jan 7 08:54:50 heba-el-kests-macbook /System/Library/CoreServices/coreservicesd[44]: SFLSharePointsEntry::CreateDSRecord: dsCreateRecordAndOpen(Heba El Kest's Public Folder) returned -14135
Jan 7 08:54:52 heba-el-kests-macbook /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer[9 8]: CPSGetProcessInfo(): This call is deprecated and should not be called anymore.
Jan 7 08:54:52 heba-el-kests-macbook /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer[9 8]: CPSPBGetProcessInfo(): This call is deprecated and should not be called anymore.
Jan 7 08:55:46 heba-el-kests-macbook /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder[99]: CPSGetProcessInfo(): This call is deprecated and should not be called anymore.
Jan 7 08:55:46 heba-el-kests-macbook /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder[99]: CPSPBGetProcessInfo(): This call is deprecated and should not be called anymore.

Imac won't start beyond white screen apple logo and circle

Imac won't start beyond white screen, Apple logo and spinning circle

Follow the steps at > Mac OS X: Gray screen appears during startup

Installed mavericks - restarted, but didn't finish iphoto update - force quit - restart gray screen stall, powers off - safe mode says disk full - recovery mode says mac and recovery HDs locked - verify disk says recovery ok - repair says no live support?

Installed Mavericks - restarted, but didn't finish iphoto update - force quit - restart gray screen stall, powers off - safe mode says disk full -recovery mode says mac and receovery HDs locked - verify disk says - recovery ok - repair says no live support?

When you see a beachball cursor or the slowness is especially bad, note the exact time: hour, minute, second.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

I get white screen with logo after update OS 10.6.6

Yesterday I download the update, get the message intall and turn off so I did it.
Today i turn on the imac and it wont start, i get the white screen with the logo. I´ve triied almost everything...
Change disc permissions
Veryfy disc
Restart on safe mode
Turn on and off
Please help!

Try booting from your install disc again. Make sure that error was corrected.
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
(In Mac OS X 10.4 or later, you must select your language first from the installer menu)
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your startup disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. Make sure there is always 15% free space.

White Screen, Apple Logo, Spinner on startup after failed software update.

Hi, so my Macbook was performing poorly this morning and I decided I would try to install updates. The updates started normally, but around halfway through the bar stopped moving and the text underneath it said, "Running Installer Script." I left it alone for about three hours, came back, and saw that it was still doing the same thing. I decided it was time to try to reboot, and foolishly held the power button down for several seconds until it turned off. Upon turning it back on, I discovered that it would only go as far as the white screen with the apple logo and the thing spinning under it for about 20-30 seconds, then the screen will go black and it will try to start up again. I started it in verbose mode and it gives the following errors before crashing:
disk0s2 i/o error 0 [level 3] [readuid 0] [facility com.apple.system.fs] [errtype io] [errno 5] [iotype read] [pblknum 233675120] [lblknum 540]
disk0s2 i/o error 0 [level 3] [readuid 0] [facility com.apple.system.fs] [errtype io] [errno 5] [iotype read] [pblknum 233674536] [lblknum 467]
disk0s2 i/o error 0 [level 3] [readuid 0] [facility com.apple.system.fs] [errtype io] [errno 5] [iotype read] [pblknum 233674640] [lblknum 480]
I haven't tried booting from the disk because my disk drive has been broken for a while and needs to be replaced. I assume this problem is my fault, but I would very much appreciate anyone's input on how to resolve it.

Hello and welcome to Apple Discussions...
You would be better off posting in the Leopard v10.5 forum here.
Using Mac OS X Leopard
This is the Safari forum. Just copy/paste the same post over there.
While you are waiting for a response there, try the help here.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
You can get replacement system disc(s)...
Call Apple's Customer Support - in the US, (800) 767-2775 - for a nominal S&H fee. You'll need to have the model and/or serial number of your Mac available.
Carolyn

Lightening Strike - restart stuck on white screen (with logo)

Power just went out and now our iMac ('11) wont restart. When I power on, the start up sound plays and then a white screen with the apple and an spinning circle underneath. After 10 mins, I shut it down and tried again. Any ideas?

ChipandTaz wrote:
dumb question but what I looking for? I did it and then got a screen of stuff and then a prompt. When I typed "exit" to boot system, it locked up.
I think it was hanging anyhow wasn't it. The idea behind the verbose was to see what was going on in the boot proccess just prior to it hanging. What was it doing? I assume not a fsck since that would be a disk check (like Disk Utility repair) and that migh take longer.

Did anyone else see an Arabic caricature after the IOS update flash on the white screen either before or after the "hello".

Did anyone else see an Arabic caricature flash briefly when the white screen appeared? I don't know for sure if it was before or after the "hello" greeting.

If you leave it alone, it goes through several languages in a loop.
It's character, not caricature.

White screen, apple logo and spinning wheel on startup

I Have a MacBook Pro mid-2012 and suddenly it froze, so I tried shutting it down, but when I turned it on there was this grey screen at first with the apple logo and a spinning wheel. After a few times I shut it down and turned it on, the screen turned white, but the apple logo and the spinning wheel remained. I tried Safe Boot, reseting the NVRAM/PRAM and Internet Recovery. None of them worked. On internet recovery, the bar is stuck at the beginning and after an hour there is an error that says apple.com/support -5010f. Why is there an error on Internet Recovery and what can I do to fix my MacBook?

I hope you have a backup (preferably a bootable one).
Here’s a reference, read this first: Gray, Blue or White screen at boot, w/spinner/progress bar
You don’t mention booting to your recovery partition, you can try that.
There is also single user mode: (restart, hold down ⌘S until you see a black screen with white text) and repair your hard drive. Here's a reference with directions: Repair Your Hard Disk in Single User Mode | Everything Macintosh
If you have a bootable backup (like a clone that you made with Carbon Copy Cloner) you could try to boot from that and then use it to either
repair your usual boot drive
erase your usual boot drive and restore from the backup
If you have a bootable installer (like a thumb drive that you made with Diskmaker X (DiskMaker X (formerly Lion DiskMaker) then you could boot from that and see if you can repair your HD or erase and reinstall.
If you have a third party utility like Techtool Pro (Techtool Pro 7) that is on another partition of your drive or on a separate disk you could try to boot from that and see if you can repair your HD.
If none of that works then maybe your HD has a mechanical failure and needs to be replaced.

My imac wont get past the white screen with logo and rotating wheel

i was trying to turn on my imac when suddenly ot took forever on the white screen
i tried taking off everything connected to it-no change
i tried a safe mode after a few minuted a heard the second chime then a blinkin
question mark folder showed up so i turned it off again and tried a nvram/pram reset but it still stuck on the white screen
is it time to visit the apple store or is there something else i should try?

A flashing question mark or globe appears when you start your Mac
Reinstall Lion, Mountain Lion, or Mavericks 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, or Mavericks
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 is three times faster than wireless.

Yosemite update left me with white screen. How do I recover?

Yosemite update from App Store has left me with a white screen and I can do nothing! How do I recover or complete installation?

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.

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Hi, the iMac is about a year old and showed suddenly a problem with the screen. It turned blue and it disapeared only by pulling out the power cord.
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For the past couple of days my mac mini has been stuck during startup. It plays the startup chime, loads the white screen then the logo appears and it freezes there.
The RAMs were upgraded a few days ago, but it worked fine for a while after that.
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