The mountain lion installer won't let me install on my Macintosh HD

I've downloaded the installer for Mountain Lion, but it won't install to my HD. I use a separate USD drive for Time Machine, which I ejected before trying the install (it wouldn't work before I restarted after trying with the USB drive attached).

RCW1947 wrote:
I've downloaded the installer for Mountain Lion, but it won't install to my HD. I use a separate USD drive for Time Machine, which I ejected before trying the install (it wouldn't work before I restarted after trying with the USB drive attached).
What are the specs of your iMac?
Pete

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After I loaded Mac OS lion, it won't let me install my Sierra Wireless telstra. It keeps telling me to install it even though i already have. help please?

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After installing Mountain Lion, mac won't let me type password to log in.

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See http://kb.mozillazine.org/Software_Update (Software Update not working properly)
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e time machaine use the MAC HD drive. How do I get this Installed?

Welcome to Apple Support Communities
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Welcome to Apple Support Communities
It's quite possible that the power supply failed. The failure is difficult to be related with OS X Mountain Lion, so I would discard that. In some cases, it's normal that you experience slowness after installing a new OS X version because Spotlight indexes the hard drive.
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Where can I find my mountain lion installer included with 2012 mac mini

I just bought a 2012 mac mini and I want to install mountain lion on an SSD that I bought separately. Where can I find the mountain lion installer file to create a bootable USB install drive? When I go to the mac app store, mountain lion is not listed in my purchases and when I try to buy it, it says "We could not complete your purchase. OS X Mountain Lion is not compatible with this computer." It's already installed on the mac mini, I just need the installer file so I can install it on my SSD.

keg55 wrote:
You might be able to simply boot into the ML Recovery HD, select Reinstall OS X and point to your SSD drive. You won't capture the InstallESD.dmg file to create a USB thumb drive installer.
OR.... to create a USB thumb drive of your pre installed ML, you would need to redownload Mountain Lion then grab the InstallESD.dmg file and create your USB thumb drive.Here is how I've done it using Internet Recovery to get my pre installed OS X.
Attach a USB external drive to your system. Formated as Mac OS Extended (Journal) and GUID partition table.
Restart using Command+R+Option to boot into Apple's Recovery HD. This will get you the original version. Or just Command+R to boot into your ML Recovery HD.
Select Reinstall OS X from the OS X Utilities menu.
You will have to watch the download. After it completes and your system restarts, at the black screen disconnect the external USB drive.
After you are back to your current desktop, insert the external USB drive. There should be a single folder on the drive called 'Install Data' (I think). Find the InstallESD.dmg file and copy it to a folder on your current system (Downloads, for example).
Follow any of the internet instructions to create a ML USB thumb drive.
I tried this method, and while it did get me the installer image, when I restored it to an external and tried to use it to restore a Late 2012 Mac Mini, I got the same "No" symbol I did with other ML installers.
Here are some screenshots of what was loaded onto my external before I yanked it, when the screen turned black durring the restart. The highlighted file is what I restored to my external to use to restore the Mac Mini.

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I want to do a clean reinstall of Mountain Lion on my MacBook. I recently learned how to do it, yippee! However, in following the instructions that supposedly an 8 year old could follow, I hit a brick wall. I could not find the application/installer. I searched and searched banging my head in frustration. Then I discoverd that, after download, it is automatically deleted. Anyway, I apparently need to re-download the app from the app store. Is it that simple first? Second, how do I ensure it is not automatically deleted upon download. I hope that makes sense. It is my intent to first, make my current MacBook Pro back to original settings. Second, it is my intent to create a boot disk with a flash drive to install Mountain Lion on two other MacBooks (it is my understanding I can use it on up to 5 of my machines). Thanks in advance.

BigSky13 wrote:
Anyway, I apparently need to re-download the app from the app store. Is it that simple first?
Correct. As you purchased it in the past, you can download it as many times as you want for free, from App Store or starting into Recovery (pressing Command and R keys while your Mac is starting). If you want to download the installer, you have to download Mountain Lion from the App Store.
BigSky13 wrote:
Second, how do I ensure it is not automatically deleted upon download. I hope that makes sense. It is my intent to first, make my current MacBook Pro back to original settings.
It's only deleted when you upgrade OS X, but if you download the OS X Mountain Lion installer and you don't install it, you won't get it deleted
BigSky13 wrote:
Second, it is my intent to create a boot disk with a flash drive to install Mountain Lion on two other MacBooks (it is my understanding I can use it on up to 5 of my machines). Thanks in advance.
To do it, first download OS X Mountain Lion from the App Store. Then, use Lion Diskmaker to create the USB drive with Mountain Lion > http://liondiskmaker.com
You can upgrade to OS X Mountain Lion all your Macs without any problem, so you don't have to worry about paying OS X Mountain Lion again to install it in your other Macintoshes

How do I get a copy of the Mountain Lion OS that I can use to recover?

How do I make a disc image of my Mac Mini HD that id bootable and has the operating system with all the programs, settings and data. If I need to replace a defective hard drive it would be good to have an image on a USB flash drive to restore previous settings and the operating system -- Mountain Lion, 10.8.1. I have been told that TimeMachine does not make a true disc image. I want a "hard copy" of the operating system that does not require an internet connection.

Unfortunately, the link for getting specific hardware versions has disappeared. So basically:
Get yourself a spare hard drive freshly erased or with a freshly erased partition of around 8 GBs or more.
Boot to your Recovery HD. Select Reinstall Lion from the main menu.
From the beginning screen select your spare partition/drive as the target destination then begin the download.
At the end of the download you will observe an Install button for you to click. Now this is important - as soon as that gadget appears you must abort the installation process. There are only two reliable ways to do this quickly: a. yank the cable for the drive from the computer; b. pull the power on the computer - shut it down quickly.
This will result in your finding a folder on the drive that contains InstallESD.dmg that you can now use to create a bootable USB flash drive installer based on the special build for your model. Use it until the next public release of Lion appears or you move on to Mountain Lion.
If you do not stop the download process immediately upon its completion you will end up with an installer that always boots to a non-functioning installation progress window instead of the normal main menu.
Make Your Own Mountain/Lion Installer
1. After downloading Mountain/Lion you must first save the Install Mac OS X Mountain/Lion application. After Mountain/Lion downloads DO NOT click on the Install button. Go to your Applications folder and make a copy of the Mountain/Lion installer. Move the copy into your Downloads folder. Now you can click on the Install button. You must do this because the installer deletes itself automatically when it finishes installing.
2. Get a USB flash drive that is at least 8 GBs. Prep this flash drive as follows:
Open Disk Utility in your Utilities folder.
After DU loads select your flash 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. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
Click on the Erase button. The format process can take up to an hour depending upon the flash drive size.
3. Locate the saved Mountain/Lion installer in your Downloads folder. CTRL- or RIGHT-click on the installer and select Show Package Contents from the contextual menu. Double-click on the Contents folder to open it. Double-click on the SharedSupport folder. In this folder you will see a disc image named InstallESD.dmg.
4. Plug in your freshly prepared USB flash drive. You are going to clone the content of the InstallESD.dmg disc image to the flash drive as follows:
Double-click on the InstallESD.dmg file to mount it on your Desktop.
Open Disk Utility.
Select the USB flash drive from the left side list.
Click on the Restore tab in the DU main window.
Select the USB flash drive volume from the left side list and drag it to the Destination entry field.
Drag the mounted disc icon from the Desktop into the Source entry field.
Double-check you got it right, then click on the Restore button.
When the clone is completed you have a fully bootable installer that you can use without having to re-download Mountain/Lion.
Note: The term Mountain/Lion used above means Lion or Mountain Lion.
As an alternative to the above you can try using Lion DiskMaker 2.0 that automates the process.

The mountain lion installer won't let me install on my Macintosh HD

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