Reinstall os mountain lion

how i reinstall os mountain lion

Restart while holding down Command+R (or, if that does not work, use Command+Option+R) to use the hidden recovery option. You will first be able to repair disk using Disk Utility (if you want) and you can reinstall from there by connecting directly to Apple's servers for a download and install.
Having said that, reinstalls should be the last option: what exactly is going on that prompts you to think that you need to reinstall?

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Tried to reinstall OSX Mountain Lion 10.8.4 and every time i start with the installation i get a requested time out message, had to shut down my MacBook Pro retina. Now when i start up it automatically start internet recovery

tried to reinstall OSX Mountain Lion 10.8.4 and every time i start with the installation i get a requested time out message, had to shut down my MacBook Pro retina. Now when i start up it automatically start internet recovery for two ouers. After the internet recovery the same problem with reinstalling OSX message

Gave up on the GUI. This script derived from http://blog.netnerds.net/2012/07/os-x-how-to-setup-nat-on-lion-and-mountain-lion / seems to work for me:
gwdev=en0 # This is my WiFi connection (has Internet connection)
targetdev=en1 # This is the USB to Ethernet adapter (to give Internet connection)
/sbin/ifconfig $targetdev down
/sbin/ifconfig bridge0 create
/sbin/ifconfig bridge0 up
/sbin/ifconfig bridge0 addm $gwdev
/sbin/ifconfig bridge0 $HOST_ADDR
/sbin/route add default -interface bridge0 -ifscope bridge0 -cloning
/usr/sbin/sysctl -w net.inet.ip.forwarding=1
/sbin/ipfw add 100 divert natd ip from any to any via $gwdev
/usr/sbin/natd -interface $gwdev -use_sockets -same_ports -unregistered_only -dynamic -clamp_mss -enable_natportmap -natportmap_interface $targetdev

Time Machine backup from clean reinstall of mountain lion

I have a few niggles before and after installing mountain lion. Previously using snow leopard.
I want to do a clean reinstall of mountain lion and then use time machine to restore files and folders.
I dont want to do a full restore of time machine as i dont want to restore my niggles.
When I currently go into Time machine the restore button is alwats greyed out.
I am therefore not confident of being able to restore files selectively after clean reinstall.
I must admit I dont fully understand how time machine works after reading various tips and instructions.
Can anyone help or steer me in the right direction please.
Niggles include:-
Cant run Kaspersky or Sophos
Shutdown and restart problems
Small Desktop screen in front of blue screen after leaving idle for a while
Thanks

macfan110 wrote:
When I currently go into Time machine the restore button is alwats greyed out.
That button should be enabled once you navigate to a backup and select something.
But it's not going to work that way once you erase the internal HD. That's because the erased drive is treated as being a different one. Since the "old" drive isn't connected, you can't restore things to the place they were saved from, via the Restore button.
But you should be able to select what you want, right-click it, and choose the Restore <item> to ... option, to get a prompt to select the "new" drive.
Also, if you don't use either Setup Assistant or Migration Assistant to put your stuff back, Time Machine will do a full backup of the "new" drive. You may be able to prevent that, by telling it to "associate" the "new" drive with the old backups, per #B6 in Time Machine - Troubleshooting

Reinstalling Ox Mountain Lion

If I reinstall Ox mountain lion will it erase all my data on that partion

Depends on how you reinstall. You can reinstall over the existing system or you can erase and install. The latter will remove everything on the volume. The former only affects the system files being replaced.
Reinstalling Mavericks, Lion/Mountain Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. 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 click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion/Mountain Lion, Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Install or Reinstall Mavericks, Lion/Mountain Lion from Scratch
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 Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion, Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

I'm trying to reinstall my mountain lion, but it won't install on my regular disk

so, i have a problem.
When i tried to restart my Mac earlier today, I got the gray screen. Now i'm trying to reinstall my mountain lion, but when the install guide tells me to choose a disk to reinstall on, it says that my disk is locked.
please help, urgent!
thanks.

No, you'll lose your data. Do you have a backup? If you don't use Time Machine, here are some cloning programs you can use to make a backup. Two backups are better than one.
Clone - Carbon Copy Cloner
Clone – Data Backup
Clone – Deja Vu
Clone - SuperDuper
Clone Software – 6 Applications Tested

HT2474 I did a clean reinstall of mountain lion and for some reason the dock keeps osx lion format

I did a clean reinstall of mountain lion and for some reason the dock keeps osx lion format. Does someone how to uptade only dock application?
Tks

Try doing a Dock restart using the following Terminal command:
killall Dock
Log out/in and test. If that doesn't work.
You need to look in your user Library/Applications Support/Dock for the .db. Hold down the option key while using the Finder “Go To Folder” command. Enter ~/ Library/Applications Support/Dock. Move the .db to your desktop.
If you prefer to make your user library permanently visible, use the Terminal command found below.
http://osxdaily.com/2011/07/04/show-library-directory-in-mac-os-x-lion/
You might want to bookmark the command. I had to use it again after I installed 10.8.4. I have also been informed that if you drag the user library to Finder it will remain visible.
Then try a dock reset.
Applications/Utilities/Terminal enter the command
killall Dock
Log out/in test. If it works okay, delete the .db from the desktop.
If the Dock is the same, return the .db to where you got them from, overwriting the newer ones.

Reinstalling OSX mountain lion

My computer is acting strangely and stops all the time to work - I can hear lots of little hard drive sounds and it is very slow until it is done (usually about 10 minutes), and my Adobe CS products are crashing and creating corrupt files that keep stopping.
I tried to reinstall the system today - I couldn't use the installer that came with the computer because I have installed Mountain Lion since.
I tried installing from the 'Install OSX Mountain Lion.app" file, and it went through the motions and said it was installing, but now it appears to be exactly the same - normally I would get the welcome screen and have to configure things. It did not give me an option to do a clean install.
How can I do a new installation to get rid of the existing problems on this computer? It is only a year old (iMac i7) and has 8 gb of RAM so it shouldn't be so slow. My laptop is the same and is much faster.
thanks for any help.

I couldn't use the installer that came with the computer because I have installed Mountain Lion since.
FWIW (and future reference), you should be able to install the original system (if it was Lion):
If you use internet recovery (Command + Option + R), then the original OS version will be reinstalled after you wipe the drive.
If you use recovery (Command + R) the current OS version will be reinstalled.
If the originally installed OS version same with install disks (Snow Leopard or earlier), you can boot from that disk; however, in order to revert, you will need to wipe the drive first.
And, since you want to get rid of "existing problems", starting over with a clean install is best. You do not know if your problems are only caused by the OS or possibly some incompatibility of third party software which would not be fixed if you simply reinstall the OS over the top of what you have.

Reinstalling OSX Mountain Lion, and it says 500 hours to dowload?!? hellp

I have a MacBook Air and was suggested to delete everything on my HD before potentiallly selling my MacBook. So I followed all the instructions, disk utility, erase hard drive, go back and reinstall Mountain Lion. Anyways everything is going smoothly, but my installation time says up to 500 hours for it yo download !!! Is that crazy? Some malfunction? Or just my internet connection???
Please help

It could be a server-side slowdown of sorts, but likely is because of your connection. Are you in a relatively remote area? Most broadband connections should take a few hours or less to download the installers, which are around 4GB in size.

How can I buy Mountain Lion without download etc. Just associate with apple id to do reinstall on Mountain Lion Macbook

I am trying to reinstall a Macbook Pro that had previously been upgraded to Mountain Lion x by the old owner. When I try to reinstall I need to input an apple ID that has purchased Mountain Lion. My ID hasn't. How can I either revert back to the original OS or associate Lion with my apple ID. I have happy to pay the $19.95 just cannot find where.

You can purchase Mountain Lion using your Apple ID at the App Store. You cannot use the version installed by the old owner. In fact it should not have even been installed by the old owner when he sold it.
You can install Snow Leopard and update it to 10.6.8 in order to purchase Mountain Lion under your Apple ID.
Upgrading to Snow Leopard
You can purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard - Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store. Access to the App Store enables you to download Mountain Lion if your computer meets the requirements.
Upgrading to Mountain Lion
To upgrade to Mountain Lion you must have Snow Leopard 10.6.8 or Lion installed. Purchase and download Mountain Lion from the App Store. Sign in using your Apple ID. Mountain Lion is $19.99 plus tax. The file is quite large, over 4 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
     OS X Mountain Lion - System Requirements
       Macs that can be upgraded to OS X Mountain Lion
         1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model Identifier 5,1 or later
         3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later
         4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
         5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
         6. Mac Pro (Early 2008 or newer) - Model Identifier 3,1 or later
         7. Xserve (Early 2009) - Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
     Are my applications compatible?
         See App Compatibility Table - RoaringApps.
     For a complete How-To introduction from Apple see Upgrade to OS X Mountain Lion.

How long should it take for a reinstall of mountain lion

Hi
I have erased my HD and am reinstalling Mountain Lion. At the suggestion of apple care techs since I've been having kernel panic and overheating issues since upgrading.
Anyhow the erase and reinstall started 6 hours ago and it says it still has 11 hours to go. using wifi.
Is this normal?
Can I go and plug it in via Ethernet in the middle of this in an attempt to speed things up?
Thanks

Welcome to the Apple Support Communities
Connect by Ethernet and try downloading from Ethernet. If the speed doesn't increase, you can restart and see if the speed increases the next time you start the download, but you'll lose the download progress

Factory reinstall from mountain lion back to lion

i have a 2012 macbook pro which came with lion then i bought mountain lion and updated.
i just did a fresh reinstall of my OS and, to my suprise, lion was installed rather than mountain lion. my question is whether or not i should bother installing mountain lion when the mavericks is coming out within a couple weeks. opinions?
i dont need mountain lion for any particular reason. will i save space on my disk by just waiting for mavericks?

also, was this a bad idea in the first place?
my computer was running fine but i couldnt get postgresql to work/download. i use a software application that requires this. so, after troubleshooting with the apps software team to no avail, i decided to do a fresh reinstall. when tried, it wouldnt work. i check out utilities, ran disk repair, and it couldnt be repaired for some reason. i reformatted it and everything seems good now.

Reinstall of Mountain Lion deleted everything!!

The other day my 13" Macbook Pro froze. So I held the power button to turn it off and when I turned it back on there was a flashing folder with a question mark. I called apple support and they said to reinstall Mountain Lion, which is what it had when I first bought it Nov 2013 but I had upgraded it to Mavericks. But when it was finished and restarted, my computer was like it was when I first bought it. I went through the whole process of setting it up and creating a user account etc. When I was finally able to look around on my computer I soon realized everything was gone. I've looked in the hard drive in the users folder, but only the account I just made and the folder "shared" is in there. The person on the phone told me it would not erase anything, and yet it did. Is there any way to recover my old user account?

Restore with a Time Machine back up or a boot clone.

Clean Reinstall of Mountain Lion

I have restarted my iMac and held down cmd R. I used disk utility to erase the HD. I tried to insatall OS X Mountain Lion and when I enter my Apple ID I get the message that "This Apple ID has not purchased Lion". This is interesting as when I check my purchase history at the App store it says I purchased Mountain Lion in July 2011. I am now stuck with an iMac that does nothing. Any suggestions?

If you had installed Mountain Lion then you may have two Recovery HDs - a Lion and a Mountain Lion one. Try booting with only the OPTION key depressed. If you see a Recovery HD labeled with 10.8.x, then use that to restore OS X. Your Lion system was installed by another user from whom you most likely purchased the computer.
Otherwise, you will need to do this:
Install Lion/Mountain Lion on a New HDD/SDD
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:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your external 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.
3. 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 Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion 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.

How to reinstall OSX Mountain Lion?

I have a 2010 iMac and currently have OSX Mountain Lion 10.8.5 installed.
I would like to reformat and erase all information from my computer but don't want to go thru starting with Snow Leopard again with the original disks that came with the iMac.
I purchased Mountain Lion thru the APP store so do not have a disk for it.
Is there an easy way for me to reinstall a fresh copy of Mountain Lion and erase all content on computer?
Thanks for helping...

Hold down Command-R during startup,
From there use disk utility to erase the drive and reinstall OS X.

Reinstall OSX Mountain Lion but still access Backup

Mountain Lion has become unstable on my Solid State Harddrive (Corsair CSSD F120GB) and I'm plannng to erase and start from scratch.   Had problem before with doing this and then being unable to access my Time Machine backup.    Permissions issue.   I'm aware that I don't need to erase but after two years, I'd like to have a clean slate and try something new.   Just don't want to lose access to my docs and pictures.
Plan right now is to boot into recovery mode (option key during boot), go into Disk Util and choose erase. Then back into Reinstal OSX.   Same hard drive but fresh copy of OSX.   Will I be able to access backup in Time Machine?

No reason why not if you use the same username and password for the admin account.
Install or Reinstall Lion/Mountain Lion from Scratch
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 Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.
However, Time Machine will consider this a new device so it will want to make a new backup. Please visit Pondini's Time Machine FAQ for help getting Time Machine to continue using the old backup.

Mac Reinstaller only has option to reinstall OSX mountain lion, but...

My harddrive crashed, trying to use reinstaller on wiped hard drive, but Mac reinstaller only has option to install Mountain Lion 10.8, but i was using Lion 10.7.4. How can i purchase mountain lion or just restore the version of osx i have paid for>

Did your system come preinstalled with Lion? If so, you should be able to do Internet Recovery to redownload/install Lion (assuming that's the OS X you want back on). Restart your MBP and press/hold the COMMAND + R + OPTION keys. Make sure you have a WiFi or ethernet connection to the internet. Internet Recovery will boot to the Apple server's Recovery HD and present you with the same OS X Utilities menu as ML but with the option to reinstall Lion instead of ML.
If you want to just redownload/install ML, you mentioned your Mac reinstaller only has the option to install ML 10.8. Use that to reinstall ML; then you can use Software Update to update it to 10.8.2.

Reinstall os mountain lion

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