White screen, apple logo, sound alarm, no rsponse, what to do?

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.

Similar Messages

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

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

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.

White Screen Apple Logo

MacBook Pro is froze on the White start up screen . Reset / Restart from this screen ? Already tried running battery dead

Wow! What a waste of time. You need to adapt better habits, such as having bootable backups/clones and/or a Time Machine backup. On my machines, a simple reboot into one of those and a restoration precludes mucking with user accounts, preference settings, and manually copying stuff. Start with:
http://www.macmaps.com/backup.html and
http://www.thexlab.com/faqs/backuprecovery.html

Each time i press the power button i just have a blank white screen, and intermittent sounds/tone. No apple logo, or spinning circle.

Each time i press the power button i just have a blank white screen, and intermittent sounds/tone. No apple logo, or spinning circle.
I used to install the rEFIt to boot with win7. When I deleted win7, I didn't uninstall rEFIt. Nothing wrong with it. One day after I watched movie in full screen,I pressed esc to quit. Then I found the touchpad didn't work. I can't turn off air. I just pressed power button for a little while. It rebooted, then my nightmare just began...
I have tried everything, PRAM, command+R, literally everything. No change.
But when I plug a CD-ROM with USB, I can only here one BONG, just once, then white screen, Like waiting for something...
I took it to a service center in China, they told me the CPU had broken. SInce it's one month out of warranty, they wanted to charge me for like $250....
I really don't think that's CPU's problem. I checked the history, it seems like somebody else also had the problem before.
Can anyone give me some hints??? Thanks!!!!!! Or I have to take it back to America to check....

Impossible, there are zero, as in none, zip, nadda viruses for OS X. If you have viruses on it they are for MS Windows and will not affect OS X. I suspect the hard disk has crashed, if you have backup then it's not a big deal to have it changed, just take it into your local Apple Store or AASP for service. If you have not been backing it up you may be in for a painful lesson on why backup is critical.

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.

After prompted to update 10.9.1, my MacBook Pro updates and went thru restart but failed...I tried to start my book and gray screen, Apple logo both on, chime sounded, then went to progress bar, less than half macbook shuts down...did few times, same!!

After prompted to update 10.9.1, my MacBook Pro updates and went thru restart but failed...I tried to start my book and gray screen, Apple logo both on, chime sounded, then went to progress bar, less than half macbook shuts down...did few times, same!!
Go to system repair, there is a prompt that cannot repair live etc....I don understand!!! Help, I need the book for work tomorrow!!

Thanks clintonfrombirmingham...
After clicking "repair disk" it says DISK UTILITY STOPPED REPAIRING MACINTOSH HD, DISK UTILITY CAN't REPAIR THIS DISK. BACK UO AS MANY OF YOUR FILES AS POSSIBLE, REFORMAT THE DISK, AND RESTORE YOUR BACKED -UP FILES....
written in red: ERROR: DISK UTILITY CAN'T REPAIR THIS DISK,,,DISK, AND RESTORE YOUR BACKED-UP FILES.
how can I back up when I cannot even start my macbook? I am stuck here and have lots of important files in the hd... Please help me? Thanks you!

TS2570 tried restart and hold c key, but still only getting white screen with grey apple logo and spinning loading icon, what do I do next?

nephew had mutliple tabs open and shut down the iMac by hitting the button on the back instead of closing everything corectly. Now the only screen i get is the white with apple logo and the loading circle icon. i have attempted restart and c key with disk in but cant even get a menu to come up. What can I attempt from home before having to haul this into the store?

wireless keyboard and mouse were working prior to safe mode attempt, i was able to eject disk. still waiting on the safe mode restart. I'm not sure what I should be looking for to confirm safe mode and what the screen should look like if successfully processing. it seems to be putting off a lot of heat. BRB
Message was edited by: FeydakeeeeenHelpMePlease

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.

Gray screen, apple logo and spinning gear hang at start up

after a lengthy round of "bejeweled", i let my imac fall into screen saver mode. when i tried to log back in, i tapped the mouse and the imac flashed as it does when actuated outside a dialogue without clicking the okay button, and immediately returned to screen saver. i then manually shut down and restarted to the gray screen, apple logo and spinning gear hang. i then inserted the leopard install dvd, manually shut down and restarted pressing the option key and selected the install disc. it booted as usual. i selected the language preferred, used the utility drop down menu and selected DU, then selected the hard drive and verify permissions to reveal a pop up "Error: The underlying task reported failure on exit. Permissions verification complete." i immediately selected repair disc, and breathed a sigh of relief with the notification "appears to be ok". then utilities/start up disc/macintosh hd/restart. still get the hang. i have repeated this process several times, also resetting the PRAM as well to the infinite hang. as a matter of fact, the gear has been spinning the entire time creating this post. needless to say, i am truly at a loss. SOS!!!!!!! Please!!!!! SEND LAWYERS, GUNS AND MONEY!!!!

i have perused some of the threads posted per this topic and decided to attempt an "archive and install." i also have a 620gig acomdata external drive with close to a carbon copy of my internal. a few short minutes into the install, the imac reveals a pop up stating it cannot install some files on the hard drive, contact the software manufacturer or restart and try to install again. the internal drive is a 160gig with only about 60gigs of room, so i tried to archive and install to the acomdata instead as it has 180 gig of free space. i get the exact same dialogue once again. restart and a third attempt only archive and install will not highlight, only first time and/or erase and install. further, start up disc shows only the install disc and network as choices. so i attempt first time install on both drives and get the same pop up message again. DU recognizes both drives although verify/repair permissions does not highlight, but not start up disc.
i'm trying not to become frantic, but my patience is threadbare. i am in desperate need of sound advice as to what i need to do.
thanks again in advance,
bradley

I just watched my first movie using Apple TV and Netflix. Apple TV works great except for then I try to switch back over to tv mode I get the cable channel info on the bottom of the screen but no sound or picture. What did I I do wrong?

I just watched my first movie using Apple TV and Netflix. Apple TV works great except for then I try to switch back over to tv mode I get the cable channel info on the bottom of the screen but no sound or picture. What did I I do wrong?

It was easy to set up, easy to use, got done watching the movie. Transferred from HDMI to TV and as my question above notes. I am on TV, my cable information (show/channel/etc) show OM the banner on the bottom of the screen, I can view the channell guide, but, my screen is white, no picture no sound? Other than that I got nothin

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.

G5 turns on but display stops at gray screen+apple logo

Can someone tell me why my G5 turns on but display stops at gray screen+apple logo. The keyboard and the superdrive not responding. After a minute the fans kick in and grow louder and faster...?? I tried a reset with the P and R but keyboard N/S. USB have power. I do get the start sound then the gray logo+screen.
Thanks for the help anyone!!
G5 dual 2G Mac OS X (10.3.9) 2G RAM, 23" display

I was getting a similar issue yesterday, stuck on the
grey screen, then the G5 turned into mini turbine
engine. I'm not sure what fixed it, i took out the
plastic wind deflector and noticed three leds next to
the RAM slots were lit up.. with some quick googling
bringing me back to apple's support pages, it turned
out the lights came up because the deflector shield
wasn't in place. Anyway myabe it was slightly out of
place, but that coupled with unplugging the power
cable for some moments seemed to help, and i was able
to get past the logo screen etc..
but i was still getting intermittent issues, with
startup and programs, and getting plenty of crashes.
So i did the Apple Hardware Test, and after 3hrs it
turned out my RAM was at fault. I recieved the
machine only a week back, since then i've added new
RAM, which was the exact same Samsung RAM that apple
use, though one stick didn't share the exact same
serial, it was still the same spec.. anyway i've
removed the pair of 1GB sticks for the time being,
and since doing so, i've got my mac running to its
full strength.. i just hope i can sort out this RAM
issue and not have blown my money.
Thanks for the help but I tried the cable thing etc and nothing so I reformated the disk (clean install and I'm back to normal now...so the RAMS were not the problem in my case.
Also, I'm glad I backed up all my stuff frequently therefore, no losses...
G5 dual 2G Mac OS X (10.3.9) 2G RAM, 23' display

I have snow leopard installed as an OS. When trying to reboot a MacBook Pro I am getting stuck on grey screen with apple logo and rotating symbol. What can I do?

I have snow leopard installed as an OS. When trying to reboot a MacBook Pro I am getting stuck on grey screen with apple logo and rotating symbol. What can I do?

Maybe this might help.
http://support.apple.com/kb/TS2570

White screen, apple logo, sound alarm, no rsponse, what to do?

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