MAC PRO FREEZES ON GREY APPLE LOGO START UP SCREEN.

My computer was acting funny for the last couple of weeks. It was slugish and slow to respond. When I was using it yesterday it froze up. I forced quit it and tried repeatedly to reboot. It makes the startup chime sound and gets to the grey apple logo screen then the spinning gear stops and it freezes.
My Specs:
2008 Mac Pro
OS X Lion 10.7.4
2 x 2.8 GHZ Quad-Core Intel Xeon
10 GB DDR2 Ram
NVIDIA GeForce 8800 GT 512MB
1) Tried starting from the Lion Recovery HD partition. Received the same result (freeze on grey logo).
2) Confirmed the OS Startup Drive works. I removed the OS Drive and tried it in a HD Dock on my Maybook Pro. The drive runs normally. I'm able to navigate and open files.
3) Tied starting from Lion Startup Thumb Drive. Received the same results (freeze on grey logo).
4) Confirmed the Lion Thumb Drive works. Booted Laptop from this same device with no problems.
Now I'm scared. I'm running out of ideas. I'm guessing it is probably something on the logicboard. Does anyone have any advice or suggestions to what it could be? Is there a way I can test the logicboard myself?
Thanks for any help in advance.

The array and the OS drive are not "linked."
Nor are the drives fixed to the drive bay order. One of the drives in the array is "master" that knows what is on each sybling by the ID of the drives.
Clone the OS and keep handy. Never a need to do an OS install.
Backup the array as often as needed so the data is current and have two sets there also, ie TimeMachine for hourly or something and cloned.
What does matter is the OS version the array was created with as there are changes even during the life of the OS like Lion and not usually backward - so an array created with Leo had to be recreated with Snow, and same with Lion, only Lion 10.7.0 and 10.7.4 one was buggy, the 2nd changed the rules for 32 vs 64-bit mode drivers.
Take away: keep the last OS around, hold back on updates, make sure that you keep 10.7.3 around after 10.7.4 is out and working.
You can boot off any drive, SSD or something else and still mount and access the array.

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Mac Pro 2006 boots into OS fine but graphics freezes on grey apple logo

When I boot my Mac Pro it boots into Mac OS X fine. I can access it remotely and all seems fine however the monitor only displays the grey apple with the whit background. I know the graphics card isnt over heating because I have removed any dirt/dust and had additional fans blowing the card and it is running cool.
does this mean the graphics card is dead? if so what can i replace it with as the machine is now 5 years old?
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That last one is not a good sign. Kernel panic when starting from an installer DVD either mean you are using an installer version that cannot boot your model or there's a hardware problem.
I'm thinking your original thought may be valid. It would be provable if you had another GPU to try, but if you don't then I suppose you should replace the one you have. Of those available the ATI 5770 is an excellent replacement choice for both performance and cost unless you want to look for a different replacement card on eBay.

Mac Pro gets stuck on Apple logo

I installed Lion last week (clean restore) and everything was running fine... I left my mac for a little, came back and noticed on the top right of the mac by the time and spotlight the screen looked weird, like the screen was a different color, but it was just there. Then I realized the mac was also frozen. I held the power button and when it restarted it got stuck on the Apple logo...
I've tried restarting in Safe Mode. Held down the option key, tried using the Lion Recovery HD, a flash drive with Lion on it (that I used to install Lion with) and a Snow Leopard install disk. They all get stuck on the Apple logo. The weird thing is, my friend took out my HD from my Mac Pro and put it in his and it worked perfectly... So I thought it was a hardware problem with my mac, but the thing is, when I hold down the option key and I load into Windows 7 off of my mac it works perfectly fine, so it seems it's not a hardware problem...
Anyone get any ideas?
Thanks,
Zevie

Hardware can mean that you have something that Lion is allergic to.
Not that it prevents the machine from running 10.6 or Windows 7/8 even.
Don't repair a system with an older system. Or tool. Make sure that it is updated and compliant. Thinks like TechTool Pro 6 and DW all have to be tested, and updated. Disk Utility from 10.6.8 is probably not a good idea and does not understand the new drive partitioning. Use the Recovery Mode partition instead.
And wait. Unless you like to test a new OS or on the edge, where it bleeds.

G4 10.4.11 Update resulting in stuck at apple logo start up screen

I recently bought a used G4 PowerPC with 10.4.4 installed. I updated it using a USB stick, seeing as I haven't connected it to the internet yet. The installation finished and the Mac restarted twice. The second time, it stayed on the apple logo screen a while. I haven't had a Mac before, so I assumed it was just finishing up the update. 2 hours later and nothing had changed. I don't have the original installation disk, but I have ran fsck, with confusing results.
It told me the computer "appears to be OK", but when I attempted to reboot, it said there were some segmentation faults. http://yfrog.com/j1dsc0000128j - http://yfrog.com/afdsc0000129j - http://yfrog.com/2mdsc0000130j - http://yfrog.com/50dsc0000131j .
I should also add that I swapped the CD drive for a DVD drive just before I updated, but the drive was working fine even before I updated, and the problem persists even after removing the DVD drive.
Message was edited by: EjikeAnyanwu

How ws that USB stick formatted? Where did you get the software on it from?
General advice on updating:
It is worth noting that it is an extreme rarity for updates to cause upsets to your system, as they have all been extensively beta-tested, but they may well reveal pre-existing ones, particularly those of which you may have been unaware. If you are actually aware of any glitches, make sure they are fixed before proceeding further.
So before you do anything else:
If you can, make a full backup first to an external hard disk. Ideally you should always have a bootable clone of your system that enables you to revert to the previous pre-update state.
Turn off sleep mode for both screen and hard disk.
Disconnect all peripherals except your keyboard and mouse.
1. Repair Permissions (in Disk Utility)
2. Verify the state of your hard disk using Disk Utility. If any faults are reported, restart from your install disk (holding down the C key), go to Disk Utility, and repair your startup disk. Restart again to get back to your startup disk.
At least you can now be reasonably certain that your system does not contain any obvious faults that might cause an update/upgrade to fail.
3. Download the correct version of the COMBO update from the Apple download site. If your car runs on gasoline you would not want to fill the tank with diesel, so don’t try to install the PPC updater on an Intel Mac!
The 10.4.11 Combo Updater for PPC Macs is here: http://support.apple.com/downloads/MacOS_X_10_4_11_Combo_Update__PPC
And for Intel Macs: http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx10411comboupdat eintel.html
If you prefer to download updates via Software Update in the Apple menu (which would ensure that the correct version for your Mac was being downloaded), it is not recommended to allow SU to install major (or even minor) updates automatically. Set Software Update to just download the updater without immediately installing it. There is always the possibility that the combined download and install (which can be a lengthy process) might be interrupted by a power outage or your cat walking across the keyboard, and an interrupted install will almost certainly cause havoc. Once it is downloaded, you can install at a time that suits you. You should make a backup copy of the updater on a CD in case you ever need a reinstall.
Full details about the 10.4.11 update here: http://support.apple.com/kb/TA24901?viewlocale=en_US
More information on using Software Updater here:
http://support.apple.com/kb/TA24901?viewlocale=en_US
Using the Combo updater ensures that all system files changed since the original 10.4.0 are included, and any that may have been missed out or subsequently damaged will be repaired. The Delta updater, although a temptingly smaller download, only takes you from the previous version to the new one, i.e. for example from 10.4.10 to 10.4.11. Software Update will generally download the Delta updater only. The preferable Combo updater needs to be downloaded from Apple's download site.
Now proceed as follows:
4. Close all applications and turn off energy saving and screensaver.
5. Unplug all peripherals except your keyboard and mouse.
6. Install the update/upgrade. Do not under any circumstances interrupt this procedure. Do not do anything else on your computer while it is installing. Be patient.
7. When it ask for a restart to complete the installation, click restart. This can take longer than normal, there are probably thousands of files to overwrite and place in the correct location. Do nothing while this is going on.
8. Once your Mac is awake, repair permissions again, and you should be good to go!
If your Mac seems slightly sluggish or ‘different’, perform a second restart. It can’t hurt and is sometimes efficacious!
9. Open a few of your most used applications and check that all is OK. In this connection please remember that not all manufacturers of third party applications and plug-ins, add-ons, haxies etc, will have had time to do any necessary rewrites to their software to make them compliant with the latest version of your operating system. Give them a weeks or two while you regularly check their websites for updates. This applies particularly to plug-ins for Safari 3.
N.B. Do not attempt to install two different updates at the same time as each may have different routines and requirements. Follow the above recommendations for each update in turn.
Lastly, Apple's own article on the subject of Software Update may also be useful reading:
http://docs.info.apple.com/article.html?artnum=106695
If you are updating Safari (or just have):
Input Managers from third parties can do as much harm as good. They use a security loophole to reach right into your applications' code and change that code as the application starts up. If you have installed an OS update and Safari is crashing, the very first thing to do is clear out your InputManagers folders (both in your own Library and in the top-level /Library), log out and log back in, and try again.
So, disable all third party add-ons before updating Safari, as they may not have been updated yet for the new version. Add them back one by one. If something goes awry, remove it again and check on the software manufacturer's website for news of an update to match your version of Safari. Remember: Tiger up to 10.4.10 used Safari 2.0.4 or, if you downloaded it, Safari 3.0.3 beta. Safari 10.4.11 used Safari 3.0.4 which was not a beta. If Safari 3.1.2 on 10.4.11 is not the fastest browser you have ever used, then something is wrong!
Moreover, trying to revert to Safari 3.0.4 (or worse still, version 2) when running 10.4.11 or 10.5 can have repercussions, as Safari 3.1.1 uses a completely different webkit on which other applications like iChat, Mail and Dashboard Widgets etc also rely, and may entail you having to reinstall an earlier operating system.
Most errors reported here after an update are due to an unrepaired or undetected inherent fault in the system, and/or a third party ad-on. Two such add-on that have been frequently mentioned here for causing such problems are Piclens and Pithhelmet. If you have them, trash them.
Additional tips on software installation here:
http://docs.info.apple.com/article.html?artnum=106692
To reiterate, Input Managers reach right into an application and alter its code. This puts the behavior of the affected application outside the control and responsibility of its developers: a recipe for problems. That's not to say that issues absolutely will ensue as a result of Input Managers, but you, as a user, must decide. If the functionality of a specific Input Manager or set thereof is really important to you, you may well choose to assume the associated risk.
Again, the advice is to remove all Input Managers from the following directories:
• /Library/InputManagers
• ~/Library/InputManagers
especially prior to system updates (they can always be added back one-by-one later).

IMac g5 stalls on grey apple logo spinning gear screen, help please.

I hope someone can help, please.
I have an iMac G5 (without isight) and it doesn't want to startup. It stalls on the grey apple/spinning gear screen, with the spinning gear perpetually rotating. I've kept it on for at least twenty minutes and still nothing. Because, I've seen this screen stall when updating OSX before.
I've flashed the pram and the power management. I've also gone into single-user mode and done everything the apple support page has said: to no avail. I've tried to start in safe mode but I cannot.
I'm running max os x 10.4.10.
One other thing worth noting, the light on the bottom right of the iMac case goes on when powering up but fades out and goes dark by the time I reach the grey apple screen?!?!?! I think I remeber this light always staying on when the computer was on.
If anyone has any ideas on how to fix this, I would greatly appreciate it.
Thanks!

It could be that your power supply is failing, see if you qualify for Apple's power supply or video and power issues.
Please post back.

HT201263 My iPod touch 4th generation is stuck on the apple logo start up screen?

I took my Ipod of the charger in the morning and it's stuck on the start up logo (The Apple logo) how do I rest it, or get it past that screen?

Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

Macbook pro stuck on grey apple logo screen - HELP! I've tried everything

I've looked through the forum for help and I think I've tried everything short of erasing and reinstalling mac os x -
- I've done an fsck (got "invalid volume count", "invalid node structure", "volume check failed" errors)
- booted from install disk and tried to verify disk (same errors as above)
- tried to "archive and install" mac os but got error saying "the destination disk must be erased for installation"
I tried T-starting my laptop connected to another mac (a powerbook g4) to try to backup my files before erasing and reinstalling mac os - but the mbp hard drive won't mount on the powerbook.
My latest idea is to try installing mac os x onto an external drive - and then booting my macbook pro from the external drive... and see if I get anywhere. my only concern is, I have to make SURE the option saying "Install Mac OS X - Installs Mac OS X for the first time" does NOT delete the contents of the external drive (it is a client's and cannot be erased!). I know there is also the option that says "Erase and Install" -- but I just want to make sure the first option will NOT delete the contents of an external drive.
Anyone know for sure? Or have any other suggestions? I have some work on my macbook pro that I cannot lose. Unfortunately I have not been backing things up... big mistake that I will not repeat.
Thanks in advance.

DiskWarrior is the answer, as sig has suggested. It can sort out directory damage that is well beyond Disk Utility's repair capabilities. If you already had a bootable external hard drive of your own, I'd urge you to buy and download DiskWarrior and install it on the bootable external drive, then run it from there to rebuild the directory on your internal drive. I have to say that using a client's hard drive to solve your own problem would be appalling and unconscionable, and I hope you'll forget that idea.
If you can't see your way to buying an external hard drive along with DiskWarrior, you'll have to buy DW on a bootable disc, or order one online and wait for it to arrive.
If you can buy an external hard drive of your own in addition to DiskWarrior — and I can't think of any better use for a credit card, if cash is short — then you'll be able to boot your MBP to a Leopard installer disc, install Leopard on the new external drive, and then buy DiskWarrior as a download (rather than on a disc) and use it as I described above. After sorting out the internal drive with DW, clone the internal to the external drive with SuperDuper or Carbon Copy Cloner, and there's your backup from now on.
I should add that although Western Digital external hard drives seem to be available cheaply everywhere, I strongly recommend against buying one. Seagate drives are also widely available, and would be a better choice.
Message was edited by: eww

Grey Apple Logo when trying to Start Up Mac-OS. Halted.

So far I have been very satisfied with my Mac. This is my first one, so I am learning the ins and outs. A few days ago, my Mac suddenly started going to sleep on it's own. I think, hindsight, that it was due to the lightning storm. So I reset my PRAM and also that thing where you remove the battery and hold the POWER button for 5+ seconds. Now, my Mac chimes and shows the grey apple logo but nothing more. I put in the install disc and ran a disk utility a few times and it says A-OK. Also ran the Hardware Test a few times with no problems flagged. I Upgraded the OS from the disc (not a total reformat, so I hopefully don't lose data) and still the same persistant grey apple logo abides. I have left it on for an hour and still it doesn't advance past this screen. I am willing to Reformat as a last resort (my files were backed up less than a month ago, but I would still lose a few important files). Thank you for your help.

This thread posted elsewhere; under Power and Battery section. Please do not reply to this posting. I appologize for any confusion.

The Macbook Pro will not start past the grey Apple logo screen? Any help will be most welcome?

The Macbook Pro 13, late 2009 will not start past the grey Apple Logo screen? Any help will be most welcome? Thanks

Have you tried booting with the install disc that came with your computer?
Find it and then run Disk Utility to verify your hard drive. If errors are found, try to repair the disk.
It sounds as if the hard drive might be failing.
Clinton

Hey Guys i have a problem with my mac since last month and it wont boot up it freezes in a grey apple logo and and spinning gear any body know how to fix this?

Hey Guys i have a problem with my mac since last month and it wont boot up it freezes in a grey apple logo and and spinning gear any body know how to fix this?

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your 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 your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
a. Boot into Recovery by holding down the key combination command-R at the startup chime, or from a local Time Machine backup volume (option key at startup.) Release the keys when you see a gray screen with a spinning dial. When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in the support article linked below, under “Instructions for backing up to an external hard disk via Disk Utility.”
How to back up and restore your files
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
How to use and troubleshoot FireWire target disk mode
c. 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
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot 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.
Before reconnecting an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3
Boot in safe mode.* The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
Safe mode is much slower to boot 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 your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
*Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Post for further instructions.
When you boot 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, your boot volume is damaged and the drive is probably malfunctioning. In that case, go to step 5.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot 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 reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see above for instructions.) Select your 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 produces. Look for the line "Permissions repaired successfully" at the end of the output. Then reboot as usual.
Step 6
Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.
Step 7
Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup.
Step 8
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

PowerPC Mac Mini gets stuck at grey apple logo screen, wont start

I have a bit of a problem and would appreciate some help, im not especially good at this stuff.
My Powerpc Mac Mini froze up recently, having left it on for a few days without shutting down/resetting. I impatiently turned it off with the power button at the back. When I turned it on again, it only got as far as the grey apple logo screen, it now refuses to go past this screen despite numerous power resets, and unplugging at the power.
I have reset the PMU and the PRAM as suggested by the troubleshooting, to no avail - the PRAM did work as it changed the resolution of the apple logo, but still got stuck at the grey startup screen. Its out of warranty so I have to pay for technical support. Can anyone help?
Message was edited by: misternuge

If you have the original install disk that came with your mini, the first thing to do is to insert that, and then boot the system holding the C key down. This should force it to boot from the install disk rather than the internal drive. The reason you want to do this is two-fold: firstly that if it boots OK that way, it shows the basic hardware is OK, and secondly, it's possible that the hard drive has developed errors (likely directory damage) and the tool to check for that and attempt to resolve it is on the install disk.
Once you've got the system booted to the install disk, exit the installer and run the Disk Utility application. That should display the internal drive (and the install disk) on the left. Select the internal drive and then click 'Repair Disk'. If no errors are found, the drive is fine and the problem lies elsewhere. If errors are reported and the disk is fixed, then you should be able to reboot normally afterwards. If errors are found and Disk Utility reports 'error on exit' not having fixed them, then run it again just to be sure, but otherwise it means the drive is damaged sufficiently that Disk Utility can't fix it. A third-party application such as Alsoft's DiskWarrior will then be needed if you want to try and fix the drive and recover data, or you can simply elect to do an erase and install, meaning the drive will be reformatted and a new copy of MacOS installed. Do not do this if you have data you need to get off the drive!!

Why is my G5 is stopping on the grey+apple logo screen when starting up?

My G5 is stopping on the grey+apple logo screen when starting up and fans run faster than usual after a couple minutes. I have read many of the posts related here, but it seems none are exactly what I am experiencing. Here is what I have done:
+Disconnected all peripheral devices (except for keyboard and mouse).
+Unplugged power cord and plugged back in.
+Unplugged ethernet cable.
+Removed added memory.
+Reset the SMU button on the logic board.
+Reset the PRAM by pressing Command-Option-P-R keys. It makes its second start up chime but I still get the grey screen.
+After opening the disc door with a paper clip, started up while pressing "C" with Hardware Test CD which found no problems.
+However, also started up with Systemworks disc and ran Disc Doctor, but I get an "unexpected problem, Error found: disk error" while "Checking Directories: Catalog Structure". When trying to run Speed Disc, my hard drive doesn't even show up in the window to select it. Nor does it show up in Disk Viewer.
I have not tried to start up from the original Mac Startup or installation disc that came with the computer. I am not at my G5 right now (having to use the internet at work). If I start up with that disc, will I loose any work (if I haven't already) that I haven't backed up?
Also, the G5 manual suggests replacing the lithium battery inside the tower if I am having problems starting up. I have not read to do this anywhere else except in the manual. It mentions having problems with the date and time which I haven't so I doubt it's the battery.
Any suggestions?
Thanks,
Tony
G5 Power Mac Mac OS X (10.0.x)

First and foremost you should never use Norton Utilities Disk Doctor or Speed Disk. They will corrupt your hard drive. NUM is not compatible with modern Macs and is no longer supported by Symantec. I highly recommend you uninstall it. You will find instructions here.
You should do the following:
Boot from your Tiger DVD. After the installer loads select your language and click on the Continue button, then select Disk Utility from the Utilities menu . After DU loads select your OS X volume from the list on the left, 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. Now shutdown the computer for a couple of minutes and then restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (3.0.3 for Tiger) and/or TechTool Pro (4.1.1 for Tiger) 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.
If this does not fix the problem, then it's possible your system files have been damaged in which case you may need to reinstall OS X. You can do this by an Archive and Install which does not require erasing the hard drive. However, the hard drive must be verified as OK per the preceeding intructions.

Sometimes iMac "stuck" at Grey Apple Logo during starting up...

Hello all.
I have this very intermittent problem with my iMac, it happens like here and there so I "don't really consider it now as a serious problem"...
My iMac has a FW800 external hard drive connected as a Time Machine drive, and two 7-port USB hubs connected (but not all ports are used up - namely iPhone, 3 iPods, printer, wacom tablet etc)
I have to stress I have not have any problem with this connection in my previous iMac model (all plastic white) and when I first got this iMac, until most recently.
*When I start up the iMac as usual, it will "get stuck" at the Grey Apple Logo screen*, I know that the mac has somehow "freeze" is because the animated scroll-wheel below the logo is not there (normally it will be there, "circulating")
The only option I have is to press the back Power button, *shut down the iMac and start up again, normally the 2nd start up will be fine.*
Anyone if you have any ideas or know what's going on, please let me know
Thanks and cheers

Sounds like some maintenance might be necessary (if it's not hardware related). Check out the xlab recommendations: http://www.thexlab.com/faqs/kernelpanics.html
My G5 iMac occasionally freaks out like that too, but I've done a complete erase and reinstall of the OS, so I think it's a hardware issue...possibly some weird RAM. You might do a test removing each stick and testing.

On starting up my new iPhone 4s, it freezes on the apple logo. I have tried the reset buttons trick and have tried restoring again too but nothing works. Any other ideas? Or is the phone simply corrupt in some way?

On starting up my new iPhone 4s, it freezes on the apple logo. I have tried the reset buttons trick and have tried restoring again too but neither works. Any other ideas? Or is the phone simply corrupt in some way?

Did you try to connect in recovery mode and restore without using the latest backup?
Recovery mode and How to back up your data and set up as a new device
If setting up as new device does not work, you'll have to get it serviced or looked at by visiting an Apple Store.
Did you try to remove the ipsw firmware file and restore, to make iTunes download a new copy from Apple?
Those files are located here:
Rename, move, or delete the iOS software file (.ipsw)
iTunes uses "ipsw" files to restore your iPod or iPhone. If those files are unusable, then try deleting them, renaming them, or moving the file to a different directory. This will cause iTunes to download a new copy of the IPSW. When a restore issue is specific to a user, it is likely due to an unusable .ipsw file. If removing the .ipsw file does not resolve a user-specific restore issue, then the issue is caused by other user-specific security software settings or iTunes preferences. Creating a new user will also cause new .ipsw restore files to be downloaded in the new user. You can find the ".ipsw" files in these locations:
Mac OS X
iPhone
~/Library/iTunes/iPhone Software Updates
iPad
~/Library/iTunes/iPad Software Updates
iPod touch
~/Library/iTunes/iPod Software Updates
Note: The tilde "~" represents your Home directory.
Windows 7 and Vista
iPhone
C:\Users\[username]\AppData\Roaming\Apple Computer\iTunes\iPhone Software Updates
iPad
C:\Users\[username]\AppData\Roaming\Apple Computer\iTunes\iPad Software Updates
iPod touch
C:\Users\[username]\AppData\Roaming\Apple Computer\iTunes\iPod Software Updates
Note: If you don't see the AppData folder, you may need to show hidden files.
Message was edited by: Ingo2711

Macbook starts up with chime then white screen with grey apple logo and spinning gear appears and continues to spin

Help, Turned on MacBook Pro this morning and just get a white screen with grey apple logo and spinning gear. Cannot access desktop.

Computer starts up in Safe boot by holding down the shift button. But when I go to restart the same thing happens. What should I do?

MAC PRO FREEZES ON GREY APPLE LOGO START UP SCREEN.

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