HT1750 My I mac won't boot, I have gone to restore but the apple hard drive next to the main hard drive says the drive is "locked" ?????? What to do?

I have an IMac which won't boot up and when I tried the restore function the Hard Drive next to the Main Hard Drive says it is "locked" when I tried to use it to restore my system. I have Mountain Lion which was working fine until recently. Now I can sit LITERALLY for an hour waiting for the gear to stop spinning but not results for loading the program. HELP!!!

As of 10.8.4, the volume must be unlocked first.
Here’s how the unlock procedure works for Disk Utility:
Boot your Mac and hold down ⌘-R (Command –R) to boot from the Recovery HD partition.
Open Disk Utility.
Select your locked hard drive.
Under the File menu, select Unlock “Drive Name”
When prompted for a password, enter the password of the authorized account on the drive.
Once you unlock the disk, hold down the Option key on your keyboard and click on the File menu.
Under the File menu, select Turn Off Encryption… with the Option key held down, it is no longer grayed-out.
When prompted for a password, enter the password of the authorized account on the drive.
Disk Utility should display a progress window labeled Starting conversion to JHFS+
Your drive should now be unlocked.

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My mac won't boot up, just has a white screen with a blinking ? mark, any suggestions?

my mac won't boot up, just has a white screen with a blinking ? mark, any suggestions?

this usually means the software and hardware can't find each other for whatever reason the following article addresses this issue:
http://support.apple.com/kb/TS1440
can also do apple hardware test, following article on that:
http://support.apple.com/kb/HT1509
if you can't access the apple hardware test in the above article you can also do fsck command to check the hardware as well, following article tells how to do that:
http://support.apple.com/kb/HT1782
hopefully one of these articles helps w/ resolution!!

Mac won't boot after leopard install

hi - installed leopard on my imac but now my mac won't boot:
i have already tried the following:
1) safe mode - but won't boot
2) single user mode - ran fsck - said no issues
3) did target mode with firewire cbale to my macbook and ran disk utility - no repairs needed - and i can see all my files on original computer
4) reinstalled leopard from holding down options key - leopard installed again
but for all of abv - when i reboot i still get white apple logo screen and the spinning wheel...
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susan

tigerswim, welcome to Apple Discussions.
Did you already have Tiger installed or did you have Panther 10.3 installed? Tiger is not a free upgrade; you have to buy it & then update (for free) using the download updates from Apple. Also, you have to use a universal/retail install DVD (or CDs) to install Tiger. You cannot use the install DVD from another model Mac.

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as the title.
if i plug my external drive, via usb port, the mac won't boot and stuck at grey screen.
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Hello jason(?)
It's a LaCie external mobiel hdd, formatted as exFAT. without adapter. take power directly from usb port.
i tested it on my iMac and it works fine. boot up as normal. the only difference is my iMac is on 10.6.8 and my Air is on 10.7.2
I tested on both USB port on my Air and the problem still persist.
the read/write speed is normal (bought it like a day ago).
another thing is I don't have this problem with my external WD drive.
One thing to notice is that, I accidentally left like for like 2-3 mins and it boots. So why the question now is why it's taking so long to boot? normally it just takes <20 seconds. Seems like it tried to boot from the external hdd, doesn't it?

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Mac won't boot up. I only get the Apple logo and the "system busy" clock when I turn on my computer. Tried unplugging and restarting but to no avail.

Go to > Mac OS X: Gray screen appears during startup and work thru all the setps in that article.

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<Re-Titled By Host>

Did you mean Command + Option + R for internet recovery?
The only key commands I know that involve P is a PRAM reset:
https://support.apple.com/kb/PH11243?viewlocale=en_US&locale=en_US
Or maybe I am missing or misunderstanding something?

My mac won't boot up.. I've tried PRAM resets and fsck.

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Yes I have seen a similar problem quite recently, and ended up having to perform a software reinstallation as not even Disk Warrior could see the Hard Disk.
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Select Disk Utility and (assuming your hard disk appears) click on it and select the "First Aid" tab > Repair Disk.

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Plz help
My mac won't boot up it goes to a apple sign then the spin thing then gives me a error msg on a 10.5.8 imac what do I do?

Hi LIsa,
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 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.
Or..
Tough without the Install 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)
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The volume (name_of_volume) appears to be OK
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***** 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.

Mac won't boot after power chord became unplugged accidently.

Mac won't boot after power chord became unplugged accidently.
I have a Mac Mini running very latest version of OSX. I was making a recording with QuickTime; when I needed to plug in a USB recording device into the back of the Mac Mini, as I pulled the Mac off my shelf to do this, the power cable came out and the Mac lost power.
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So far, I've booted from the original disc and repaired the permissions as well as the disc, then re-booted, but same old blue screen.
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Hi, Nigel.
Not to differ with my colleagues here, but there's an important question that wasn't asked.
1. You wrote: "So far, I've booted from the original disc and repaired the permissions as well as the disc, then re-booted, but same old blue screen."Did Disk Utility report any errors it could not fix when you ran Repair Disk? I suggest you run the procedure specified in my "Resolving Disk, Permission, and Cache Corruption" FAQ. Perform the steps therein in the order specified.
2. You may also want to run the Apple Hardware Test that came with your Mini to be sure nothing shorted when the power cable was removed from the computer. I've seen it happen, hence I usually recommend removing the power cable at the wall before disconnecting the power cable from the computer. See my "Apple Hardware Test" FAQ.
3. Repair Disk gives your Mini a clean bill of health, the blue screen may be the result of some Startup or Login item that was corrupted due to the sudden power outage. My "Troubleshooting Startup and Login Items" FAQ can help you pin that down if such an item is causing the problem and may help you avoid and Archive and Install.
4. If you elect to go the Archive and Install route, see my "General advice on performing an Archive and Install" FAQ for some important tips on this process.
5. As FYI, this is the kind of problem that makes one glad they've implemented a comprehensive backup and recovery solution. For advice on the backup and recovery solution I employ, see my "Backup and Recovery" FAQ. Computing without a comprehensive backup and recovery solution is like driving without auto insurance.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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Welcome to Apple Support Communities.
It sounds like you're seeing a startup issue with your Mac, it's booting to a gray screen with an Apple logo. Try the suggestions in the article linked below, they will resolve most issues related to starting up your Mac.
Mac OS X: Gray screen appears during startup
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I hope this helps.
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Hi Rob, see if this helps...
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http://reviews.cnet.com/8301-13727_7-20087723-263/how-to-run-the-password-reset- utility-in-os-x-10.7-lion/
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HT1750 My I mac won't boot, I have gone to restore but the apple hard drive next to the main hard drive says the drive is "locked" ?????? What to do?

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