Boot Loop Grey Screen - Flashed Image File on Startup Disk

My computer is a boot loop thanks to my really stupid error using Terminal. I was trying to flash an OpenElec image on a USB drive but I accidentally flashed it on to my startup disk, disk1, which caused some major issues. here is the link to what I was trying to do: http://wiki.openelec.tv/index.php/HOW-TO:Installing_OpenELEC/Writing_The_Disk_Im age#tab=Mac_OSX
Instead of writing it to disk3, I wrote it to disk1 using this command : sudo dd if=OpenELEC-Generic.x86_64-5.0.0-efi.img of=/dev/rdisk1 bs=4m
Repair Disk does not work, I don't have a backup so I can't just reinstall the OS X without losing all my data? I tried using Target Mode, I able to view the HD on another Mac but all my photos are in a iPhoto library (120GB) which cannot be opened or copied due to Error -36. I tried importing the file into iPhoto on the Target Mac but get an error that iPhoto disk is full. We cleaned the Target Mac iPhoto library completely. The photos are the last 10 years of our life so we cannot lose them.
Is there a way to remove the image that I installed on the HD via Terminal so it will start up again? Can I somehow Target Mode transfer the photos onto to another Mac?
Please help me!
line 1: /dev/disk0: Permission denied
/Volumes/Cruzer/Terminal Saved Output: line 3: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 4: 1:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 5: 2:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 6: 3:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 7: /dev/disk1: Permission denied
/Volumes/Cruzer/Terminal Saved Output: line 9: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 10: 1:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 11: 2:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 12: /dev/disk2: Permission denied
/Volumes/Cruzer/Terminal Saved Output: line 14: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 15: Logical: command not found
/Volumes/Cruzer/Terminal Saved Output: line 16: 5843C88A-1AEE-455B-AA12-1B9017FBE610: command not found
/Volumes/Cruzer/Terminal Saved Output: line 17: Unencrypted: command not found
/Volumes/Cruzer/Terminal Saved Output: line 18: /dev/disk3: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 20: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 21: /dev/disk4: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 23: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 24: /dev/disk5: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 26: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 27: /dev/disk6: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 29: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 30: /dev/disk7: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 32: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 33: /dev/disk8: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 35: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 36: /dev/disk9: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 38: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 39: /dev/disk10: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 41: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 42: /dev/disk11: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 44: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 45: /dev/disk12: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 47: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 48: /dev/disk13: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 50: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 51: /dev/disk14: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 53: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 54: /dev/disk15: No such file or directory
/Volumes/Cruzer/Terminal Saved Output: line 56: 0:: command not found
/Volumes/Cruzer/Terminal Saved Output: line 57: -bash-3.2#: command not found
logout
[Process completed]

Install OS X Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.

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TS3243 My Desktop Mac won't startup, it turns on to the grey screen flashing question file. I have been able to startup from the snow leopard install cd but once I try to repair within DU the disk never appears in the side panel. The only thing there is "

My Desktop Mac won't startup, it turns on to the grey screen flashing question file. I have been able to startup from the snow leopard install cd but once I try to repair within DU the disk never appears in the side panel. The only thing there is "Media"... What can I do? Help!

If Disk Utility cannot see your drive it doesn't look good.
You could try DiskWarrior. It is expensive but can often fix directory structures where DU cannot.
Replacing the drive is also a strong likelihood. If you don't have a fairly recent backup, then it might be worth buying DiskWarrior
additonal notes;
Gray screen appears during startup

When starting the computer, I get a grey screen and following status: your startup disk is full. How can I still enter (in order to free-up some space)?

When starting the computer, I get a grey screen and following status: your startup disk is full. How can I still enter (in order to free-up some space)?

Simple way to make HDD free space is delete files you don't need anymore.
Or get bigger drive and external HDD case, then:
1) install bigger HDD in external drive case.
2) connect external drive and format and mount it with Disk Utility.
3) make clone with Carbon Copy Cloner or SuperDuper!(source drive is internal HDD, target drive is external one).
4) install external bigger drive into your Macbook Pro.
In the cace if your're using Mac Pro:
1) get bigger HDD and install it in drive bay of Mac Pro.
2) format and mount it with Disk Utility.
3) make clone with Carbon Copy Cloner or SuperDuper!(source drive is old HDD, target drive is new one).
4) Select boot drive to new bigger one.

My MacBook will only turn on to a grey screen with a file and a question mark flashing on the screen

When I turn my MacBook on a grey screen with a file and question mark in the center of the screen flashing. What can I try to
get out of this screen?

That folder with the question mark icon means that the MacBook can't find the boot directory. That can either mean it can't find the hard drive or the Operating System data on the hard drive is somehow corrupted.
Put your install DVD into the optical drive (CD/DVD drive) and reboot. Be sure to either use the disc that came with your Mac, or, if you installed a later Mac OS X version from disc, use the newer disc. As soon as you hear the boot chime, hold down the "c" key on your keyboard (or the Option Key until the Install Disk shows up) until the apple shows up. That will force your MacBook to boot from the install DVD in the optical drive.
Or if you are running 10.7 Lion, boot from the recovery partition (Command +R on boot) and use Disk Utility to repair your OS 10.7 partition.
When it does start up, you'll see a panel asking you to choose your language. Choose your language and press the Return key on your keyboard once. It will then present you with an Installation window. Completely ignore this window and click on Utilities in the top menu and scroll down to Disk Utility and click it. When it comes up is your Hard Drive in the list on the left?
If it is, then click on the Mac OS partition of your hard drive in the left hand list. Then select the First Aid Tab and run Repair Disk. The Repair Disk button won't be available until you've clicked on the Mac OS partition on your hard drive. If that repairs any problems run it again until the green OK appears and then run Repair Permissions. After repairing use Startup Disk from the same menu to choose your hard drive for restarting from your hard drive.
If your hard drive isn’t recognized in Disk Utility then your hard drive is probably dead.

When I have finished working on an image in Photoshop and I hit the save button it goes instead to the "save as" screen. This never happened in previous Photoshop versions. When I get to Lightroom, I have a grey screen the says "File could not be found."

When I have finished working on an image in Photoshop and I hit the "save" button, it goes instead to the "save as" screen. This never happened in previous Photoshop versions. When I get to Lightroom, I have a grey screen the says "File could not be found." I then have to go to "locate" to get the image. When I select the correct image, I get a message that it is not the same file name but I am eventually able to access the image. Needless to say this is having a negative impact on workflow!

The problem with write permissions for the OneDrive folder only shows up in Lightroom 6's export dialogue, that's why it's to irritating. Lightroom 5.7.1 is not having that problem nor does the file explorer. The problem also exists on both of my machines. I will try to check for other problems with the OneDrive troubleshooter though: Running the OneDrive troubleshooter - Windows Help

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.

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.

Grey screen flashing question and apple logo

My power mac G4 wont boot passed a grey screen flashing apple logo and question mark. Have tried every option that the support can give you. still nothing. tried the apple hardware test and doesnt seem to be effecting it at all??? What should i do?

If you hold the Option/alt key at bootup, what shows as boot choives?
"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
Or does it not show at all?
Tough without the Install disc, but some things to try...
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

Why is my screen flashing a file folder with a question mark?

Why is my screen flashing a file with a "?" in it?

There are several possible reasons. Click here and follow the instructions; if the computer was running Mac OS X 10.6.8 or earlier and you reach the third set of steps, insert a Mac OS X install disk.
(120982)

IMac wont boot Past Grey Screen, finder folder with blinking question mark

iMac G5 won't boot Past Grey Screen. The G5 froze and i restarted, It will not go past the grey screen and it has the finder folder with blinking question mark, also the fans kick on wide open. As it atempts to boot a sound plays "beepda beepda beepda beep" that starts quiet and gets louder and repeats a couple of times. I ran a hardware check on the startup disk and all hardware passed. I thought it might be the RAM any suggestions?
I have restarted using the troubleshooting methods in the guide.

Sorry for the late reply. The drive shows up when booting to disk, but it will not allow you to verify disk or repair. Also it will not allow you to select the hard drive to reinstall the software. Under disk utility Maxtor sabre shows up with total capacity:0 bytes.
I've taking the Mac to the Apple store to get looked at, and its probly the hard drive. Now Im trying to see if theres a way to recover the data myself. I've used software like "Data Rescue" the hard drive shows up "Maxtor Sabre" totally capacity: 0 bytes, and it will not recover anything.
Did this test just to see if it was power problem.
http://support.apple.com/kb/HT2173
Thats when noticed the beeps are coming from the hard drive. So its getting power.
Now just wondering how to recover data.
Any suggestions?

Hello to you all, my Macbook Air won's boot up and upon diagnosis, i realized my startup disk is full to 99% even with 2GB Hard Disk space. It wont also enable me boot into safe mode too. Please help as all my work documents and project files are on HD

Hello to you all,
My Macbook Air won's boot up and upon diagnosis, i realized my startup disk is full to 99% even with 2GB Hard Disk space. It wont also enable me boot into safe mode too.
when i power up, i get this prolong gray screen which wont change screen but remain so. Infact i am handicapped.
Please help as all my work documents and project files are on this machine and i can't afford to loose them all...
Please, should you have any solution please send me the details to [email protected]
Thanks you a millionh times.
Al.

The MBA seems to cause several problems to several users on boot ups
On start up my MBA would not boot up the apple logo came on but only a blank screen appeared no fan i followed several start up recommendations but to no avail so I took the MBA to the nearest Apple repair centre again the same symptoms on start up ......very sorry sir you need a new mother board that will be $500 not feeling confidant in the product declined and was going to put it on ebay for spares.
On return home I pressed the start up button and it started normally everything was working fine i decided to reinstall all the software what has caused the problem I have no idea but it is after several attempted reboots it finally started on its own so don't give up if you have this problem it may come to life

TS2570 Does this also include the scenario where the grey screen has a picture of 2 disk drives?

Does this also include the scenario where the grey screen has a picture of 2 disk drives?
One is labelled Macintosh HD and the other is Recovery HD.
The computer doesn't always start up like this but it has a few times now.

This screen shows up if your holding the option/alt key down or perhaps if it's stuck or damaged.
It's called Startup Manager and shows your bootable options.
Another possible cause is your PRAM is not remmebering the System Preferences > Startup Disk selection.
Do a #2 Reset PRAM and head to System Preferences > Startup Disk and set it and hopefully that should resolve the issue.
..Step by Step to fix your Mac

Unable to update software or upload pics from SD card-how do I remove files from startup disk? Please help!

Unable to update software or upload pics from SD card-how do I remove files from startup disk? Please help!

Hello Smile_333
The article below will assist with finding things and help increase the hard drive space for your computer. The best way is to have an external hard drive to copy things to if you do not want to delete and loose things.
OS X Mountain Lion: Increase disk space
http://support.apple.com/kb/PH10677
Thanks for using Apple Support Communities.
Regards,
-Norm G.

TS1440 When booting up, grey screen with a 'folder icon' with 'question mark' flashes?

When I boot up, a grey screen appears with a folder icon with a question mark inside it. The Mac won't respond to and commands or anything, only the On/Off Power button.
Any ideas? If you read my previous question, you can see what happened before all of this started happening.
Thanks,
-Dylan

Did you follow this procedure?
http://www.dummies.com/how-to/content/how-to-install-or-reinstall-mac-os-x-mount ain-lion.html

IMac refuses to boot up - grey screen, first aid failed

Hope someone can help me...
Recently downloaded the latest intel mac securiy update - ver. 11 - since then my iMac began to take a long time to boot up. It started fine this monring but upon shutdown and subsequent restart this evening my machine reaches the grey screen stage and then seems to 'loop' continuously - no log-in screen is ever reached.
I tried power off, unplug all cables - no results
I tried safe boot - no joy either
Booted from back up cds - ran disk utilities
verify disk - it aborted at the catalog check with invalid node structure, 1 HFS volume could not be repaired messages
verify disk permissions - it froze
tried install and archive - message was installation failed
Is there anything else I can try apart from erasing my hard drive and installing from scratch?
This seems to have started since I downloaded the ver 11 intel security update...
any advice greatly appreciated
Hazel

Hi Hazel, and a warm welcome to the forums!
Don't try to Repair Permissions or anything else until the Disk Structure is fixed.
You must repair the HD, if Disk Utility or fsck should fail to repair it, your best bet is DiskWarrior from Alsoft, you'll need the CD to boot from if you don't have another boot drive...
http://www.alsoft.com/DiskWarrior/
But sometimes fsck will work if you do it a few times, not likely, but possible.
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
Tough without the Tiger Disk problems, but try fsck...
To use fsck, you must run it from the command line. Unlike using your mouse to open an application to do something, you'll need to type a text command at the prompt (#) to tell fsck what to do. The Terminal application (/Applications/Utilities) and single-user mode are two examples of command-line interfaces in which you can type such commands. To use fsck:
1. Start up your computer in single-user mode to reach the command line. Hold CMD+s keys down at bootup. Note: If necessary, perform a forced restart as described in the Emergency Troubleshooting Handbook that came with your computer. On desktop computers, you can do this by pressing the reset/interrupt button (if there is one) or holding down the power button for several seconds. On portable computers, simultaneously press the Command-Control-power keys. If your portable computer doesn't restart with this method, you may need to reset the Power Manager.
2. At the command-line prompt, type /sbin/fsck -fy
(SPACE between fsck AND -fy important)
3. Press Return. fsck will go through five "phases" and then return information about your disk's use and fragmentation. Once it finishes, it'll display this message if no issue is found: 
The volume (nameofvolume) appears to be OK  If fsck found issues and has altered, repaired, or fixed anything, it will display this message: *** FILE SYSTEM WAS MODIFIED ***   Important: If this message appears, repeat the fsck command you typed in step 2 until fsck tells you that your volume appears to be OK (first-pass repairs may uncover additional issues, so this is a normal thing to do).
4. When fsck reports that your volume is OK, type reboot at the prompt and then press Return.
http://docs.info.apple.com/article.html?artnum=106214

Boot Loop Grey Screen - Flashed Image File on Startup Disk

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