Cisco UCS C220 MS SFF won't boot past BIOS screen with 2x1.2TB SAS drives installed

We have been running a few of these servers with only a 500GB 6GB SATA 7.2K drive installed with all VM's (Hyper-V) sitting on an attached SAN.
For various reasons we needed some local storage on the server and installed 2 1.2TB SAS drives (10K 2.5"). They hot installed okay but the server had to be brought down to enter the MegaRaid software to configure the RAID.
Unfortunately with the drives installed, the server won't boot past the initial BIOS screen and certainly doesn't get to the RAID screens.
Does anybody have any idea why this would happen? Is there some BIOS update required to support these drives and/or MegaRaid software upgrade?
The servers are up and running at the moment so I can't find the version of the RAID software running.
Thanks
Larry

Hi Lauren,
If you don't have a PCI or a mezzanine based controller and you are using the embedded raid controller you need a chip for the embedded raid controller to support SAS drives. By default the embedded controller only supports SATA drives. See page 9 of the link below
Please let me know if you are not using the embedded controller
http://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-c-series-rack-servers/C220M3_SFF_SpecSheet.pdf

Similar Messages

Macbook Pro won't boot past grey screen with Apple logo and then shuts off

This is a long story...
This morning, I would turn it on and it'd go to the grey screen with the Apple logo for a few seconds and then go to the icon that is a circle with a line through it. After reading online, I was able to boot it up in Safe Mode. I messed around a little bit in system preferences thinking I could fix it on my own, not really knowing what I was doing (I'm a *******). I went to Startup Disk in Preferences. I chose the MAC OS X, xxxx and then clicked the lock to prevent further changes and then clicked restart.
Now when I turn on the macbook, it goes to the grey screen with the Apple logo for at least two-three minutes and then just shuts off. Won't boot into Safe Mode now. Please help. I already tried the Command-Option-P-R keys trick like five times.

If you have a full retail DVD for 10.6 you can boot from that by holding the C key during startup...but you will then be in install mode if that is what you want to do. At least go ahead and see if it will boot ok from the 10.6 disk and then you can decide what you want to do further.
Apple does not have 10.5 for sale anymore from what some other users have said on here so if you want to go that route you will have to find a copy for sale such as from eBay or one of the Mac resellers.
Before taking the machine to someone, try booting from 10.6 and see if that works...that way you can narrow down problems the machine may be having.

Macbook won't boot past grey screen with Apple logo and spinning wheel.

For some reason, after about 1 year and 10 months of owning my Macbook, it decided this morning not to load past the grey screen with the Apple logo and spinning cog/wheel.
I used it for a couple of hours beforehand, and it was working fine. Software Update prompted me of about about 4 or 5 updates; I can't remember exactly what was downloaded, but I think there was a Security Update and iTunes among them. I restarted, left it to install with no errors, but when I logged in, Safari and iTunes were running incredibly slowly. I also noticed that the volume keys weren't responding, as well as the power key to bring up the "Sleep, Restart, Shutdown, etc" dialog box. I forced shutdown, hoping a restart would solve my problem, and that's when my troubles started. I originally just left it, but after about an hour the wretched thing was still spinning.
So far, I have done a number of troubleshooting tips on a variety of websites. I have tried taking the battery out and holding down power for 5 seconds, resetting the PRAM with option, cmd, p & r, and holding down power until the sleep light flashes rapidly and the computer lets out a large "BOOOP".
I have booted off my Leopard install disk with both option and c, repaired the hard drive a number of times, with there being no errors whatsoever. I have tried repairing permissions, but everything seems to freeze up, except the mouse.
For some reason my computer will not boot into safe mode, either, and holding cmd & s at startup doesn't get me to the stage where I can enter commands with the keyboard.
Unfortunately, because of my puny 60GB hard drive, I only have 1GB of free space left and cannot reinstall Leopard without wiping my hard drive.
I would greatly appreciate it if anyone could assist me with this unfortunate dilemma. It's such a shame that my computer has been fantastic for so long and now decides to play up. (Maybe it's just Apple trying to get me to buy a new 2.4Ghz aluminium Macbook sooner than I was planning...)
Thanks very much.

Hi ds,
Sorry to hear you're having such trouble!
Unfortunately, the best thing you can do at this point is reinstall Leopard (and then attempt to install the combo updater, too). If you don't have a backup of your machine, you could boot it into Target Disk Mode (by holding down T at startup) and then attach it via FireWire to another computer to salvage your files.
I recently had to repair a machine with this exact same problem, and after messing around with that for several hours, I'd have to say that I think that an Erase and Install is the way to go. If you then migrate over your user data and start having troubles, you at least know where the problem lies. I suspect, though, that having a clean machine with all of the new updates applied will be the end of the issue.
Sorry to be the bearer of bad news. There are a few other things you could try first; you could, for example, manually download the relevant combo updater from Apple's website and attempt to install it to your damaged machine while it's in Target Disk Mode. If you have a copy of Disk Warrior, that too is certainly worth a shot (and in some cases may be the saving grace). In my experience, though, a failure of this magnitude isn't easy to resolve.
Hope that helps.
—Hazy

G4 mirror can't won't boot past grey screen with dark gray apple

Before this the computer was operating fine.
I just went and downloaded the latest versions of itunes and Safari. It stated that I had a corrupt download of itunes. It went thru the normal downloading/install procedure. When it went to restart from the install, it just hangs up at the light grey screen with the dark gray apple and I get the spinning wheel. It stays here for one/two minutes, then shuts itself down. Any ideas for fixing? Also I do not have any install disks. Thanks.

*Option 1*: Boot from your bootable backup drive, then erase the internal drive and clone the backup to the internal drive. You can use Disk Utility in the Utilities folder on the backup drive. Don't have a backup? Good time to start planning a backup strategy. Move on to:
*Option 2: Download AppleJack* - VersionTracker or MacUpdate - and read the documentation carefully. Then install the utility and use it to perform repairs and maintenance on your normal startup drive. Note that to use AppleJack you must be able to startup in single-user mode. If the existing system is unable to start properly into single-user mode, then you cannot use AppleJack.
*Option 3:* Purchase a copy of Leopard from an Apple Store or Apple retailer. Use it to reinstall OS X by doing an Archive and Install:
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.

System Won't Boot Past White Screen With Apple Logo

I have a Power Mac G5 tower that someone gave me. No hard drive.
I placed a NEW hard drive in and installed 10.4 onto it. When I finished I turned OFF the machine. When I now try and turn the machine ON, it will freeze-up during boot up at the white screen with the Apple logo. The little spinning ring/dial doesn't come up.
The system is:
Power Mac G5 (June 2004)
Model ID: PowerMac7,3
dual 2.5GHz
512MB RAM (2x256MB)
Using the Boot-up in Detailed SAFE Mode I was given the info below. Any help is greatly appreciated.
using 1310 buffer headers and 1310 cluster IO buffer headers
kld(): Undefined symbols:
ZN11IOPCIBridge18compareAddressCellEmPmS0
kldload_frommemory() failed for module com.apple.driver.AppleMacRiscPCI
Failed to load extension com.apple.driver.AppleMacRiscPCI.
Couldn't alloc class "AppleMacRiscPCI"
kld(): Underfined Symbols:
ZN11IOPCIBridge18compareAddressCellEmPmS0
kldload_frommemory() failed for module com.apple.driver.AppleMacRiscPCI
Failed to laod extension com.apple.driver.AppleMacRiscPCI.
Couldn't alloc class "AppleMacRiscAGP"
kld(): Undefined symbols:
ZN11IOPCIBridge18compareAddressCellEmPmS0
kldload_frommemory() failed for module com.apple.driver.AppleMacRiscPCI
Failed to load extension com.apple.driver.AppleMacRiscPCI.
Couldn't alloc class "AppleMacRiscHT"
kld(): Undefined symbols:
ZN11IOPCIBridge18compareAddressCellEmPmS0
kldload_frommemory() failed for module com.apple.driver.AppleMacRiscPCI
Failed to load extension com.apple.driver.AppleMacRiscPCI.
Couldn't alloc class "AppleMacRiscDART"
ApplePlatformExpert::getGMTTimeOfDay can not provide time of day RTC did not show up

Does it boot into any of these modes?
Target mode...
http://support.apple.com/kb/HT1661
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
We might get clues with verbose mode...
http://support.apple.com/kb/HT1492

My iMac won't boot past grey screen and it didn't come with a os x disk

My iMac won't boot past grey screen with apple. I've tried booting in safemode but that didn't help and my iMac didn't come with a os x disk.

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 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.”
b. 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.
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
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 either of the techniques in Steps 1b and 1c 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 you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
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, or if a firmware password is set, or if the startup volume is a Fusion Drive or 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 10. 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
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 10
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 11
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 12
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.

Cisco UCS C220-M3 Server doesn't boot after adding Intel I350 Quad Port NIC

Hello,
We have purchased 2 Cisco UCS C220-M3 rack mounted servers (Single Processor) that have a dual port I350 LOM. We also purchased two Intel I350 Quad Port NICs to expand the available ports on each server from 2 to 6.
The problem we are facing is that the server will not complete the boot process unless we disable either the LOM or the Quad Port NIC. We have tried numerous settings in the BIOS area but we haven't managed to have them both working.
The I350 Quad Port NICs are from Intel and not from Cisco and we are running the latest FW/BIOS on the Servers as of March 10 2015.
We have followed the steps described in the installation guide to install them.
Could you provide some light in this situation please, what are our options?
P.S. Although the LOMs are I350, the MAC Address Vendor is Cisco, is it possible that Cisco servers accept only Cisco Branded Expansion Cards?
Thank you,
George

Hi Shawn,
At least I'm not the only one having the same problem!
You are trying to use the cards with the LOMs enabled?
Which screen are you referring to in the first paragraph of your message?
Mine sits in BIOS POST for about 10 minutes and then resets itself....
We are also waiting for an answer from Cisco, so any findings/news will be posted here.
Thanks,
George

HP8540w (540M) ram upgrade, won't boot past bios

I have recently acquired new RAM. First it was 2 x 8 gb but I found out later this is not supported by my specific model.
But now I switched it with 2 x 4gb PC12800 CL11, from a newer hp model and it still won't boot past the BIOS, which has been upgraded to the latest version.
The Bios recognizes the RAM perfectly but still it won't boot into windows. When I see the windows 8.1 logo it gives a sudden shutdown which is followed by a restart. In theory the pc12800 should work, albeit clocked down to 10600 to match the motherboard & processor.
It feels inadequate to have a 3 year old laptop which is not able to go past the 4gb, especially because I bought it since it was the elitebook version and military graded. I wanted to have something future proof, not a machine that needs to be replaced after 3 years. It feels like just threw 150 dollars out of the window.
So I'm hoping that there's another solution that I might have overlooked.
This question was solved.
View Solution.

Well the recommended memory is PC3-10600 aka DDR3-1333. On some models it actually downclocks to DDR3-1066 speed. I think the memory you have installed from a newer model is just not compatible. If it is DDR3-1600 it might even be low voltage memory which is almost certain not to work.

PowerBook G4 won't boot past blue screen

I've read a couple of posts with similar problems. The jist is, I did a security update/restart earlier and now my laptop won't boot past the blue screen after the white screen with the gray apple. I think I'm on Mac OS 10.4.11 but I had it on auto-update so that could be incorrect.
I've booted from the install disk and run a diagnostic from the First Aid bit in the Disk Utility. It says that there are no errors found and the S.M.A.R.T. status says "verified" as well. It won't let me boot into Safe Mode (although, I could be doing that wrong as I'm not exactly clear on how to do it - pressing S doesn't seem to do anything, but if I press Command + S it takes me to a text listy thing and I've run the "fsck -f" system check (which seems like the same as the disk utility check?) from there and also gotten the "volume is ok" message. There was also a suggestion to run some kind of diagnostic after booting with the D key from the install disk, but I was never able to get the disk to boot from the D key, only the C key.
I'm sure that this is kind of the "same song, different verse," kind of post, but I've not read about volumes registering as okay. I'm a little wary of a archive-and-reinstall as I've not ever done that before (so, if that's the suggestion you have, I would really appreciate loads of specifics on how that works so I don't mess up!)
I've read in several instances suspicion of a hard drive problem but I've not had any slow downs or any crashing. I did travel to the UK for about 10 days, but I didn't even change the time zone on my laptop while there, so I don't think that's it (but I suppose it could be.)
Lastly, I did recently replace my keyboard. A few keys had become non-responsive so I replaced it and have had the new keyboard for a bit over a month.
Suggestions? Ideas? Sorry if it's a repeat post -- just felt like the circumstance was a teensy bit different. And also, thanks very much for any info you can give.

Linsey:
If you can boot your computer into Firewire Target Disk Mode and you have access to a second Mac that supports firewire, you may be able to back up items that have not been backed up previously.
If you are able to back everything up successfully, and you have tested your backup to be sure it is sound, then we can proceed with re-installation of the OS. The best option is to completely reformat and erase the HDD and then install the OS from disk. (I will post complete step by step directions). This will enable you to start with a clean slate/HDD. Your other option would be to use the Archive and Install option. Think it over and let me know how you want to proceed.
cornelius

G4 Power Mac won't boot past gray screen

I have a mirror door g4 power pc that had been having some issues with not turning on, and after testing the power supply, it failed miserably. We placed a refurbished power supply in it from a company in New York and the computer was working wonderfully. I went on a cruise last week and went to turn the computer on for the first time in a week and a few days. The CPU turns on, the unit chimes, the fan turns on and the computer starts to boot up, but it won't boot past the gray apple logo screen.
Actually, the first few attempts to boot it resulted in a blue screen with gaint apple logo and spinner; it wouldn't advance further. After several restarts and resets, I got it to come up into the normal gray screen. On several attempts it wouldn't boot further than this. On two occasions now though, it has moved past the gray screen to normal operation (it takes about an hour for it to get to that point though) but with some kind of errors. I get the side bar, but the gray panel on to with "file" ect is gone and my HD icon never comes up. The icons on the sidebar do not respond when clicked.
The computer will not boot from the OS X disc.
What's going on, hard drive? Virus? Something else?

You likely have hard drive directory issues or worse.
Virus is just a hopeful whimsy.
No virus.
I hope that you have a backup of your data.
Try a Safe Mode boot. This forces system repair of the directory (if possible).
Hold Shift while starting to enter Safe mode. Be patient, as it can take several minutes to complete.
Failure to boot to the OS X disc is not good. A severely damaged drive can prevent boot while connected.
Disconnect your boot drive and try booting to the OS X disc.

Powerbook won't boot past apple screen, disk utility can't repair

Last night I applied the most recent software updates, I don't remember exactly what they were but there was a Java update, a security update, a quicktime update and an itunes update. after the required restart, my powerbook g4 won't boot past the apple icon screen.
I can't boot it into safe mode or single user mode.
I can start it up in target disk mode and transfer a handful of files/directories at a time before it hangs.
When I try to run the repair in Disk Utility against the target disk, it gets about halfway before the following:
Verify and Repair disk “Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid sibling link
Volume check failed.
Error: The underlying task reported failure on exit
1 HFS volume checked
1 volume could not be repaired because of an error
the disk doesn't make any grinding or anything, just a few clicks when it tries to boot but nothing bad sounding.
Is my computer hosed? Is it worth bringing it to the genius bar?

Hi, Pat. How much time did you give DW to complete its work? Locating the data it needs to rebuild your directory can take a while — that's the step at which DW far outperforms other utilities. It digs deeper and tries harder than anything else, and that can take a long time. The longest successful DW "fix" I've seen reported here in the seven and a half years I've been participating in Apple Discussions was *14 days* of continuous work to find the necessary data and reconstruct a hard drive directory from it. That was after all other disk utilities had been tried and had failed; it was the user's last hope to save data that hadn't been backed up anywhere. If you haven't allowed DW at least a few hours to accomplish its task, give it another chance. And don't try to use the computer for anything at all while DW is working.

Ideapad K1 won't boot past Lenovo screen

HELP! My IdeaPad won't boot past the lenovo splash screen. Here's what happened...
It has an AOSP version of Android on it which has been running fine for over a year - never had a problem with it. Yesterday, I tried to awake it from sleep but nothing happened. So I held the power button down until it switched off. I then restarted it and got to the password screen. After entering my password it became unresponsive - it just stalled with the desktop screen on. I gave it 10 minutes but it never became responsive again.
I reset it by holding the power button again until it switched off then I switched it back on. It has never got past the Lenovo splash screen. I've tried booting it loads of times, giving it a full charge, taking the SD card out, giving it a rest, leaving it booting for the whole night...nothing has worked, same result.
I also tried connecting it to the computer and using NV-Flash to put a new image on. It seems to work okay but when it re-boots it still won't get paast the Lenovo splash screen.
I'm desperate for anyone to give me some hints and tips as to where to go from here. Any help would be greatly appreciated!

Hi,
I am having a similar problem. My 3 month old ideapad u510 froze last night while surfing the internet. nothing worked as far as getting shutdown menu in windows 8 to even work (just froze), so pushed power button till it turned off. immediately afterward, tried to boot by pushing power button and it just stopped booting at lenovo screen.
i've tried to boot a few times since and sometimes i see progress thing (circle of lights...similar to status bar) going other times not. i am not sure what key it is but can get to bios screen sometimes too. was hoping there was safe mode boot in bios but doesn't appear anything thats useful so didn't change anything. it just doesn't boot to windows after exiting bios.
my hunch is that i need a bootdisk or sort. importantly, would like to avoid resetting or refreshing, etc.. until have opportunity to get data off harddrive if possible. some important stuff on there that need to get off first.
Help is very much appreciated.
Thanks,
J

G5 won't boot past grey screen

G5 2.0 Dual will not boot past grey screen. Running 10.5.8 on an old maxtor 160gb drive, drive is available as a startup disc in StartUp disk in system preferences. But when it is chosen the machine shuts down in the usual manner then switches to the maxtor disk and only gets to the grey screen with the apple log no progress clock appears. Using disk utility from install disk reports that drive is ok, running techtool pro 4.6.2 reports the drive is fine and all file structures, volume structures and directories are fine. So of course i am keen to find out what the issue is and wether it can be resolved without resorting to a clean install. When booted from another internal drive the icon for the errant drive is visible and all files and folders are visible and readily accessable.
It would be great to get back to booting from this drive as it is the main drive I use and has so much more on it than the secondary drive.
Any help will be of immense use
Thank You

I assume you have already tried a PRAM reset. If so, then the following three items may yield a clue.
Number one thing to try is a Safe Boot by holding the shift key down at boot. You may have a something in the non-minimal Apple kext set that is causing the hang. (If it safe boots, you may have a problem in kext caches which can be cleared. See below.)
Second is to disconnect all peripherals except monitor, keyboard and mouse and see if something there is contributing to the hang.
Third is to use verbose boot (hold down cmd-V at boot until you see a black Unix terminal screen come up) and see where the system is hanging.
Clearing the kext Caches (if indicated)
This is probably easiest done booted from the other drive, so I'll describe that method.
Open the Maxtor's System folder, then open the Library folder and drag the following two files to the trash:
Extensions.kextcache
Extensions.mkext
Empty the trash.
Open a Terminal session from the Terminal application in the /Applications/Utilities folder.
Type cd followed by a space in the command line and then drag the icon for the Maxtor into the window, which will put a properly formatted Unix path into the command line, then press the return key. Type the following three commands
cd System <cr>
cd Library <cr>
sudo touch Extensions <cr>
then give your password when requested and close the terminal session. Select the Maxtor as the statrup drive in System Preferences and give it a go.

Computer won't boot past gray screen

I can't get my computer to boot past gray screen. It keeps showing the apple logo and the spinning wheel. What can I do to get into my system?

Startup - Gray, Blue or White screen at boot, w/spinner/progress bar
Startup - Gray Screen
Startup Issues - Resolve
Startup Issues - Resolve (2)

Mid 2010 MacBook Pro won't boot past blue screen

I've been having problems booting up my MacBook. I can't get past the blue screen. It went from booting slow at the grey apple logo screen to not booting up at all. Is it a problem with my hard drive? I also have boot camp running as well, but I can still see the boot camp drive for windows and my OS X drive, as well as my installation disk when I have it inserted when I hold the option key at start up.
I'm still able to run windows on it without any problems when I pick the windows drive. I tried different methods from different forums but I'm just not getting through. I tried holding 'c' to boot up from cd and I let it run over night but it never got past the grey apple screen with the gradient wheel (still spinning). I had already used time machine to back everything up before this happened since I was able to boot up properly (but slowly). Can anyone help? It's driving me nuts, and I can't remember what os/firmware version I'm running.

n your signature you said you are running 10.6.3. So let’s assume you are running Snow Leopard.
It sounds like your diagnosis of disk problems is correct. The OS X partition may be corrupt.
Try booting in Safe Mode.
http://support.apple.com/kb/HT1564
Try again to boot in normal mode.
If it will boot in Safe Mode but not in normal mode then you could have some 3rd-party software preventing the boot or you could have a corrupt disk or OS.
Boot as from the startup manager (Boot - option) and then select the installation disk.
Hopefully that will work better than starting with the Boot-C option.
Then try to repair the system disk.
Start the Disk Utility.
Perform the steps in http://support.apple.com/kb/PH5836.
If it repairs OK but still won’t boot reinstall OS X.
Installing Mac OS X 10.6 SnowLeopard
http://kb.iu.edu/data/akav.html

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