SL installed on Mac Pro. Stuck at Gray Apple Logo

So I installed Snow Leopard tonight and now my Mac Pro doesn't get past the Gray Apple logo. It also won't recognize me holding down any keys on the keyboard (can't reset pram can't boot from CD etc). I took the hard drive out of the computer and hooked it up to my laptop using an external adapter and ran Disk Repair on it. Disk Utility reported that the disk appeared to be okay. I could also see all of my content on the drive, so it doesn't appear to be dead. However it does appear that my Mac Pro might be doing something funky? Please help!

Mac Pro? That's one with multiple HD bays, correct? If so, then restore the bootable backup/clone or Time Machine backup of your previous system that you put on one of those other HDs.

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Macbook pro stuck at gray apple screen with spinnning wheel

My Macbook pro is stuck at the gray apple scrren with a spinning wheel. I noticed the internet was not working yesterday so I restarted and now can't get in.

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Stuck on Gray Apple logo screen, Gear keep spinning.

I have macBook. I was preparing m self for iPhone Development.
So i was installing the reference libraries. I click 2 or 3 library to get download, window become irresponsive. I was little impatient to know what has happened that what happened to my computer, I did powered it OFF, just form the next booting, my mac book is getting stuck on the gray screen with apple logo, gear is keep spinning.
I googled and read several article about the stucking of aaple product. but got nothing, just new combination of keys then new style of booting.
I came to know about the single user mode, I did that it went to single user mode
I did
fsck -fy and mount -uw /
it checking the root file system and told that file system modified.
then after typing the exit it start doing something and screen scrolls up.
then it just stuck on this mDNSResponder line...
(com.apple.mDNSResponder153): posix_spawnp(„/usr/sbin/mDNSResponder“, ….): No such file or directory
it not able to find it and keep trying for it. it seems this will run forever,
Can someone please suggest something that might fix this?
what is the procedure to restore from the install DVD, will it overwrite the all data which id in the Mac HD, or will just over write the system files.
But I want to keep this a last option, when everything is failed.
Any assistance would be greatly appreciated and I will love if something can tell me about the problem also

Try the following:
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger.) 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 quit DU and return to the installer.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

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.

START-UP STUCK at GRAY APPLE LOGO WINDOW

On my older "original" MacBook Pro... I have received "Start-up Disk Almost Full" messages a couple times. Last night I did some software updates, and now the computer won't go past the chime, gray screen, apple logo and spinning wheel. Did the updates "exceed" my start-up disk level? Is there a way to get past that? Delete something? Move stuff to external hard drive? How do I make room on my "start-up Disk"? Especially when I can't get past the start-up gray logo window? I've tried resetting my PRAM but nothing changed.

To the best of your knowledge how much free space was on your hard drive the last time you looked? You could try connecting to another Mac via firewire and booting your MBP into target disk mode and get files off of there. You should try to maintain at least 15% free hard drive space least you trash the drive and make it unable to boot. (Which sounds like you have already). Hopefully you can rescue the hard drive.

Mac Pro stuck on gray screen after installing software for a new keyboard

I am having a huge issue with my very important work computer! For a few weeks, my Mac has been freezing on the gray screen during start up. Since I had two external hard drives plugged in, I would unplug one of them and the Mac would always restart correctly once one was unplugged. Well today I was installing software for a new keyboard and the mac prompted me to restart. Once I restarted, the gray screen came up again and no matter what I did it would not start up correctly again. I tried unplugging everything except the keyboard and monitor and nothing works. I tried ejecting the crash-causing CD with the keyboard using all of the commands I found on this forum board and nothing worked. I saw forums about manually ejecting the CD by pushing a pin-hole but I cannot find that pinhole anywhere! Then again, the CD might not even be the problem but since the computer gave me the gray screen of death right after using the CD I am thinking that it is the problem. I use this computer for editing a TV show and creating websites so there is a ton of files on it and I need to get it up and running again ASAP. Any suggestions would be appreciated and I am sure by now you can tell that I am not a Mac expert so please dumb it down for me. Thank you!!

I would start by breaking your thoughts and sentences out from one long paragraph.
Start at the basics.
Always have backups.
One at least that is a spare boot system you can use.
Clone your system. SuperDuper does a great job for only $29
Boot from another hard drive or last OS X DVD
Repair your drive with Apple Disk Utility along with 3rd party disk maintenance and repair
Hold Option key until the boot manager, then hold mouse to open optical drive.
You can hold mouse on startup and it will eject also.
Hold and continue to hold Shift key during startup to repair the boot drive in minimal fashion.
What device and driver? hint: never use CD, just go online as the CD is usually out of date anyway.
Fill in Mac OS X version and more about hardware would help in posts and in your profile signature.
http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html
http://www.macintouch.com/readerreports/harddrives/index.html#d12aug2010
http://www.alsoft.com/DiskWarrior

MacBook Pro stuck on login apple logo

I had 10.5.8 on my MacBook Pro 5,1
I needed an upgrade to 10.6
So I found this DVD somewhere " Snow_Leopard_10.6.1-10.6.2 _SSE2_SSE3_Intel_AMD_by_Hazard "
I started installing OSInstaller.mpkg
Installation process got stuck at 31 minutes where it was installing SystemBase
I got desperate and hit the power button to restart OS.
Now its showing screen like I gave in link " https://www.youtube.com/watch?v=PE-D5urdn8Mhttp:// "
and I need anything that help me to install OS X any version
Please Help
Thank You

The following support article is somewhat outdated. Where it refers to booting from an installation disc, you should boot from your recovery partition (if running 10.7 or later) by holding down the key combination command-R at the chime.
Mac OS X: Gray screen appears during startup

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

Mac book pro will not start apple logo spining wheel then gray screen then a circle with a line through it

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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. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
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Which Hardrdrive should I install in Mac Pro, 13", Late 2011, 2.8Ghz i7 4RAM 750H

Please could you tell me Which Hardrdrive should I install in Mac Pro, 13", Late 2011, 2.8Ghz i7 4RAM 750H
Tx

Any 2.5" diam formfactor SATA HDD or SSD will be compatible. As a start, look at the representative sample available from OWC:
eshop.macsales.com/shop/hard-drives/2.5-Notebook/
It is very easy to do the installation yourself and it will be a lot less expensive.
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MacBook Pro takes a long time to start up or hangs at gray apple logo after minor fall

I upgraded to Mavericks a few days ago. Everything was working fine until yesterday, when my MacBook Pro started taking a really long time to start up or restart.
Before upgrading I had some directory problems which I fixed with DiskWarrior. I then upgraded to Mavericks. There was also a fall that I took, which resulted in the MacBook Pro hitting on one corner and getting a minor dent (It was inside a padded messenger bag when I fell). It worked fine for a whole day, but the next day it started slowing down and getting stuck.
I run DiskWarrior again and there was more directory problems, which were fixed again. When I start the MacBook Pro from an external HD with Mac OS X 10.8, there is no delay in starting up. When I switch to the internal HD, then I get very long delays (5-10min) or hangs at the gray apple logo screen.
DiskUtility did not report any problems, neither did SMART report.
Could it be that the HD got somewhat damaged and gets stuck intermittently? Is it possible to start up OK some times and others to get stuck?
How can I check the HD? Shouldn't the SMART report indicate a problem?
Any help would be greatly appreciated as this is my main work computer!
Chris

I think that my Mac was shutdown when it fell, but I am not 100% sure.
I did perform both SMC and PRAM resets. I will also try to run maintenance scripts. Thanks for the suggestion.
It keeps on taking around 10min to restart now, but it has not frozen yet.
The other very strange thing that happens (and this was the first sign I had when it started acting up) is that Mail.app cannot connect to my IMAP servers (a host provider and Google), even though my Mac connects to the internet. I have the MacBook Pro on the same ethernet network as my home iMac, and I get mail without a problem on the iMac! So something is blocking the mail on the MacBook Pro.
This happened for the first time on Friday and after that I kept having the long delays in startup or freezes I mentioned before.
Could those two be connected?
When I use an external HD as as start up I can get mail fine.

G4 will power on, but is stuck on gray Apple screen

I've read several posts regarding starting-up the G4 but can't seem to find anyone with a similar issue. Before I had this problem, I installed a DVD to Mp4 converter program. I suspect that this could be the culprit but am not sure. And I'm not sure how to get back to my main operating system. On start-up the gray Apple logo appears, but no circle to indicate continued booting. Any ideas?
Thanks!
PowerMac G4 Mac OS X (10.4.2) Added USB 2.0 PCI Card

I'm having the same issue in that I get the gray apple. If I wait long enough, the screen eventually turns pale blue and then freezes.
I am unable to boot up in Safe Mode by holding the Shift key down, and when I use the DVD, the system boots up in OS-9 format making OSX unaccessible.
Could it be that I need to reinstall OSX software? If so,do I need to remove any existing programs first, and if so, how do I get "at" it, since I can't boot up into OSX.
Thanks in advance.
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I just got an eMac G4-1Ghz/256/80/SuperDrive/56k/220v the problem is, it's stuck on theLoading Screen everytime i turn it on it wont go any further it's stuck on the Gray Apple logo with whiteBG and the loading icon that keeps circling any ideas?

i got this emac from my uncles friend, and they said it's still working so i was likeok lemme see. and when i turned it on i was like "nice it really is working" but right after it went to the loading screen (Gray apple logo with a whiteBG and the loading icon that keeps circling) it wont go any further.. it just stays like that forever.. OMG any ideas???? thanks

Hello, do you have the Install Discs for it?
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

MacBook Pro was having Finder/Freezing issues, Tried restarting and now it wont reboot. Been stuck at the apple logo/loading screen for over an hour.

MacBook Pro was having Finder/Freezing issues, Tried restarting and now it wont reboot. Been stuck at the apple logo/loading screen for over an hour.

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