Imac has over 300gb of space. After downloading from app store I click on to install, agree with terms and conditions click next and nothing happens. Currently running lion 10.7.5
iPod touch, its running version 4.3.3
If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Select "/var/log/install.log" from the file list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar. Then select the messages from the last installation or update attempt, starting from the time when you initiated it. If you're not sure when that was, start over and note the time. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. Don't post more than is requested.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Edit it out by search-and-replace in a text editor before posting.
Try the following procedure:
1. Reboot with the Command-R keys held down to get to the OS X Tools
2. Open Disk Utility, then select your boot drive and use the First Aid tab to both repair the disk and fix permissions.
3. Restart your system, this time holding the Shift key so the system will boot into Safe Mode.
4. When the system loads, go to the Applications folder and run the Install OS X Mountain Lion program to perform the upgrade.
Note: In Safe mode the system will run slower and feel less responsive.
If this procedure still does not work, then you can use the downloaded OS X installer along with an external USB or firewire drive (at least 8GB) to create an OS X installation drive. To do this, follow the instructions in this article: http://reviews.cnet.com/8301-13727_7-57479690-263/how-to-create-an-os-x-10.8-mou ntain-lion-install-drive/
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Can't install Mountain lion upgrade on 2011 iMac
