instalare Maverick pe Imac 2009 late

Download the Mavericks installer from the Mac App Store and make sure it’s in your main Applications folder. (This means that if you followed my advice to move the installer out of your Applications folder, you’ll have to move it back, at least temporarily. The Terminal command I’m using here assumes the installer is in its default location.)

Connect to your Mac a properly formatted 8GB (or larger) drive. Rename the drive to Untitled. (The Terminal command used here assumes the drive is named Untitled.)
Select the text of this Terminal command and copy it:

sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction

Launch Terminal (in /Applications/Utilities).
Paste the copied command into Terminal and press Return. Warning: This step will erase the destination drive or partition, so make sure it doesn’t contain any valuable data.
Enter your admin-level account password when prompted.

The Terminal window displays the progress of the process, in a very Terminal sort of way, by displaying a textual representation of a progress bar: Erasing Disk: 0%... 10%...20%... and so on. The program then tells you it’s copying the installer files, making the disk bootable, and copying boot files. Wait until you see the text Copy Complete. Done. (see the screenshot below), which could take as long as 20 or 30 minutes, depending on how fast your Mac can copy data to your destination drive.