On start up I get grey screen with wheel turning but it goes no further

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.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, boot from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If 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
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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Hi my iMAc 27 inch starts up to the grey screen with apple logo and loading bar underneath it loads halfway then freezes up and shut down after a while please help

Hi my iMAc 27 inch starts up to the grey screen with apple logo and loading bar underneath it loads halfway then freezes up and shut down after a while please help

Try the tips listed here Mac OS X: Gray screen appears during startup - Apple Support

HT4904 I need to repair my start up disc so I have to start up from installation disc. In doing so, my computer restarts, I hear the mac sound, then a grey screen and then turns off and goes on in this cycle endlessly. Why can't I restart from disc?

I need to repair my start up disc so I have to start up from installation disc. In doing so, my computer restarts, I hear the mac sound, then a grey screen and then turns off and goes on in this cycle endlessly. Why can't I restart from disc?

Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple
logo appears.
5. Wait for installer to finish loading.

TS3423 my start drive not responding. getting grey screen with question mark in a folder. when i use disk utility drive wont mount

When I turn on my Mac I get a grey screen with a folder with a question mark . Have tried the disk utility to no avail as the disk has apparently dismounted and will not mount even though the mount option is available. I have recently upgraded from snow leopard go os x maverick

This could be a software/state problem or a hardware problem. In your case it sounds like the latter but you should try the steps below in case it might help.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570

G5 freezes at startup, get grey screen with logo, but no spinning gear

As subject says, I get the Grey Startup screen with aple logo, but no spining gear.
do i need a new install of OS X? Or ???

Hi wampaskitty, and a warm welcome to the forums!
Could be many things, we should start with this...
"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. (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 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.
If that doesn't work, Boot off your original G5 Install Disk while holding down Option/alt key to select AHT, then run the extended Apple Hardware Test.

Getting Grey Screen with Apple..and progress bar.. This is what I get

Greetings all,
I desperately need help..My macbook pro was running slow, and so looking online I found something about resetting smc and pram. Well I did both and the computer booted up fine. Then on my next reboot the machine wouldn't start. I'm getting the grey screen with the apple. A progress bar shows for a second but then goes away. I'm not able to get into safemode. But I was able to run the disk utility program from the snow leopard cd. Basically tellls me that the keys are out of order and then says "Error: Disk Utility can`t repair this disk...disk, and restore your backed-up files." This has to be bad.. I don't have a backup.. but luckily most of my stuff was on my macmini (I just had a baby so I had alot of pictures)
Is my only option to erase? Right now the hard drive won't mount (atleast through the disk utility, since it can't repair it)
Please tell me I have other choices.

So you also have a Mac Mini? Then you might be able to retrieve files from the bad hard drive using FireWire Target Disk Mode:
http://support.apple.com/kb/HT1661
FWTDM will allow you to mount your Mac's hard drive on the Mini's desktop and it will be just like any external hard drive. You will be able to copy files from it.
Another option would be to remove the drive from your Mac and place it in an external enclosure, which would essentially turn it into an external drive. You would then install a brand new drive into your MBP.
It is possible that you could repair the drive with a stronger utility such as Disk Warrior. However, DW only repairs the complex software on your drive--it cannot repair a drive which is beginning to fail, which could well be the case with yours. You don't say exactly which MBP you have, but the average useful life of a laptop hard drive is 3-5 years, and many fail within the first year. Often the kind of problems you are seeing are due to a drive beginning to fail, so your first priority will be to get your data off of the drive.
Since you were also seeing slowness, I suspect that your hard drive is headed south. If so, there wouldn't be much point in reformatting. It would just destroy your data, and your drive may still not ever work properly again. You can get a new drive for less than the price of Disk Warrior, although it's possible that DW can fix the corruption on your drive, at least for a while.
Also, how full is your drive? If too full, that could be a contributing factor.
If you do decide to try Disk Warrior and succeed in getting up and running, you should run SMART Utility:
http://www.apple.com/downloads/macosx/systemdiskutilities/smartutility.html
You can download the demo and run it several times for free. It will give you a comprehensive view of the physical health of your hard drive.
What I would recommend is that you try FWTDM first and try to get everything off of the drive that you care about. If the drive is failing, it could fail completely at some point, so getting your stuff off of it is your most important priority.
If FWTDM doesn't work, then the next thing to do is to remove the drive and put it in an enclosure and see if it will mount that way.
The newer unibody Macs are designed so that you can replace the hard drive yourself. If you have an original MBP, you may want to get an AASP to install a new drive and give you the old one back in an enclosure. If you are under warranty, this won't void your warranty. If you are under warranty, Apple will replace a failed hard drive, but you won't get to keep the old one.
If you are out of warranty, you could consider replacing the drive yourself using the directions at ifixit.
Once you have gotten out of this fix, it's time to set up a backup strategy.
Good luck! Post back if you have further questions.

Macbook Pro does not start. Grey screen with logo and status bar going on forever.

I have a Macbook Pro, late 2010 running with OS Mavericks. Lately it became very slow but never had major issues like crashing. Lat night, I tried a hard restart because it was stuck and I cannot get it to restart ever since. I get sound and grey screen with logo. The status bar is going on forever but does not boot. Can anyone help, please?

Try a safe boot:
http://support.apple.com/kb/HT1564
If no success, boot into recovery:
http://support.apple.com/kb/ht1310
Select the recovery partition and then from the 4 option menu select Disk Utility.
Open Disk Utility>First Aid and run Verify and Repair.
What are the results?
Ciao.

G4 Won't start. Stuck at Grey Screen with Spinning wheel

It won't make it past this screen.
I have a Dual G4 867Mhz with 2GB ram. (3) harddrives.
Any Help would be greatly appreciated.
Thanks
The last thing that happened was last night I left my computer on downloading some stuff. When I woke up my dad had unplugged the ethernet cable and It had locked up some programs with the spinning beachball. I proceeded by trying to shut the program with apple+q. It shut down the Finder window. I then was forced to just shut down the computer by holding down the power button. I didn't try starting up again at that time, but now about 3 hours later I tried to start up again, and it's stuck at this screen.

Install OS X on one of your disk drives. Or get a FW case and drive, then update to 10.3.9.
Buy a copy of Disk Warrior 4.
Ask Dad.

G5 gets grey screen with logo then goes black, won't boot from any disk

Won't boot from any disk, already changed VRAM battery, no success. tried hardware disk once and ran a full scan, said error with Video, but now won't boot at all with any disk. Screen is choppy also(have pic). Thinking video graphics card? Not sure. Need help!

Hi bribiel, and a warm welcome to the forums!
It certainly sounds like the Video card from the little info we have, & that can certainly cause it to fail to bootup.

My imac at start up only gets white screen with a folder with a question mark flashing.

My imac gets a white sceen with a folder with a question mark flashing.

Here's the apple article on the issue:
http://support.apple.com/kb/TS1440?viewlocale=en_US
Regards,
Captfred

Grey screen with message "turn off computer with power button until switch off then press again power button"

Dear all,
I'm very hungry with my iMac and my Time Capsule :
I try for two weeks to restore my iMac without any success...
I wait 80 hours to finally have the message again and again : "to restart your computer : turn off computer with power button until switch off then press again power button".
But my iMac do not work !
Could you help me?

Hello, that's a kernel panic...
http://thexlab.com/faqs/kernelpanics.html
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X 10.6 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 won't go beyond grey screen with wheel

My problem:
I don't know if it's related, but i erase essentials files on windows bootcamp that has access to my Macintosh HD partition with software enablinf hfs+.
I repaired my Windows partition, but since then my Macintosh HD crashed.
At first, it wasn't even mountable, but I finally plugged it as an external harddrive on another mac and I recover data with Data rescue 3, I repaired it with DiskWarrior, repaired permission, and repair with disk utility.
I don't know why but journalisation wasn't on anymore so i turned it back on with Recovery partition.
I would like to know if it's possible to repair this last problem.
In verbose:
dyld: Library not Loaded: /usr/lib/libicucore.A.dylib
     Referenced from: /System/Library/Frameworks/CoreFoundation.framework/versions/R/CoreFoundation
     Reason: image not found
com.apple.launchd 1     com.apple.launchctl.System 2     The system bootstrapper has crashed: Trace/BPT trap:5
And nothing else after.

To be honest, I don't remember exactly what did the trick, but after repairing my drive in diskwarior, i was finally able to see it from the lion recovery partition, so I did a reinstall (like update Mac OS X) and I didn't lost too much finally but i had a little older time machine backup, so i recombined my backup for files that I lost and the files that were still on the computer.
I still don't know exactly what was the cause of the problem, but I don't give bootcamp access to my mac partition anymore.

Another iBook cannot get past the grey screen with spinning gear

I have read the other posts on iBooks not starting up. I too have used Onyx recently but this was to cure the problem of a freeze. Now start up cannot get past the grey screen. PRAM has been zapped and safe mode will not work. Worse, the CD drive will take CDs so cannot go back to start up disk.
Bizarrely, a visit to the Apple Store and the iBook started no problem. System was reinstalled using archive option and various health checks apparently showed no problems. But then got back home and again start up froze at grey screen with spinning gear. I have left it on this for over 15 minutes but to no avail. I have tried to connect to another ibook using T key to get target mode. I'm not sure if I am doing this right. I have started up working iBook plugged in the firewire to both machines and then started up ailing iBook holding down T key. 2nd iBook wont start at all.
Any suggestions?

An Archive and Install will preserve you user settings and data. You will need a minimum of 5 GB free on the hard drive to perform an A&I; you can reduce the space required by about 1 GB by selecting the option to install language support only for the language you use (assuming you don't need multiple languages).
However, after seeing your other post (BTW, it'll be easier to keep track if relted issues are in the same thread), you do not want to try an A&I if Disk Utility is reporting anything about 'could not be repaired'. Doing so will would ensure problems down the road, if it worked at all. It's possible for one disk problem to mask another. Whenever Disk Utility (or any other repair utility) reports making repairs, it's good practice to repeat the repair until it reports no problems found or it becomes clear it cannot repair the disk.
DiskWarrior has an excellent track record at repairing problems that Disk Utility cannot (especially Disk Utility versions prior to OS X 10.4.2).
If the drive cannot be repaired, you may be able to keep it by doing an erase install with the write zeros (one pass) option. That will update the hard drive firmware record of bad disk sectors to avoid using. If there are only a few bad sectors, that may let you keep using the hard drive for several more years. An erase install will do just that to your data, through. If you have access to another Mac with either a large amount of free disk space of a DVD burner, you can try using the other Mac as host and the eMac as target in FireWire target disk mode. You can run the host's copy of Disk Utility on the eMac hard drive, and hopefully be able to mount the emac HD so that you can back up the data in your Home directory.

Computer won't start, grey screen with Apple logo only. Ideas?

Last night my wife's G5 froze. It is a G5 2.0 running OS X 10.4.11. I shut it down (had to use the power button) and tried to restart. No luck, just made it to the grey screen with Apple logo and spinning wheel. After a few seconds the Apple logo disappeared and a black box took its place, then the wheel stopped spinning. It was late, decided top wait until morning before trying again.
This morning I tried to start up again. This time got a warning(?) in upper left that a Firmtek item had already started. I'm sorry I didn't write this all down at the time, so I don't remember the entire message. Since there is a Firmtek card installed in one of the PCI slots I thought that might be the problem, and I pulled the card, as well as another Adaptec card that was also installed. Tried to start again, got to grey screen with Apple but this time no spinning wheel.
Opened media slot manually and inserted Diskwarrior. Tried to start with Diskwarrior but again only reached grey screen. Let run for ~5 minutes, until fans started to run and were begining to get noisy.
Next I reset the PRAM. No luck, still stuck on grey screen. Tried Diskwarrior again, this time got another message in upper left. Here is most of it -
System Failure : cpu=1; code=60000009 (Invalid pmap)
Lateset crash info for cpu1;
Exception state (sv=0x609bb280)
PC=0x000a4ad0; MSR=0x02003000 followed by more similar strings, then
backtrace terminated - unaligned frame address; 0xfc088891
So what's the diagnosis? I've had various issues with my G5s in the past, but have never had one refuse to boot with Diskwarrior before.
Thanks in advance for any help!

Whew, could be many things, from RAM, (or RAM slots/solder issue), to CPU #1 being bad, (CPU#1 is actually the second one.
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 macbook pro 2011 shows grey screen with apple logo and want start

i was just using my macbook pro and it freezed for a while not responding and i turned it off by pressing the power button. afterwards, i turn it on and it shows a grey screen with apple logo but want start pls somebody help me because am having "my life" on the machine

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 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, 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.
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.
If you've booted from 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 step 1.) 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 may produce. Look for the line "Permissions repair complete" 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
A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
Step 9
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.

On start up I get grey screen with wheel turning but it goes no further

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