How to install OS X Yosemite 10.10

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Phase 1: Boot up your Mac from the bootable installation disk.
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Select in which language you want to install the system. The language can still be changed after the system installation.
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Select “Disk Utility” to create a partition to install OS X.
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Select your hard disk or SSD at the top the list on the left.
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Change the keyboard layout by clicking on the upper left flag and select your keyboard layout.
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Select “1 Partition” in the scroll menu.
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Give a name to your Partition and click on the “Apply” button.
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The system will ask you if you really want to create a new partition. Click on the “Partition” button.
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When the new partition has been created, you can close Disk Utility by clicking on the red dot on the upper right corner of the window.
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Select “Install OS X” in the OS X Utilities menu and click on “Continue”.
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Just click on “Continue”.
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Read the license agreement and click “Agree”.
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Select the drive on which you have just created the new partition and click on “Install”.
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The system start to copy the installation files on the disk. When the process has finished, the Mac will reboot.

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Phase 2: The Mac reboots and the installation process begins.
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After the installation process, the Mac will reboot once again.

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Phase 3: The Mac reboots and the configuration process begins.
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Select your country in the scroll menu. If you cannot find it, just click on “Show All” and select the right one.
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Select the keyboard layout you want to use.
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Select “Don’t transfer any information now” and click on “Continue”.
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If you have an “Apple ID”, you can sign-in here or do it later.
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Read the license agreement and click on “Agree”.
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Type in your username and password and select an image for your profile. Click on “Continue”.
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If you want your computer to send anonymous info to Apple, select these options. Click “Continue”.
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Here is the final screen of the configuration process.
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Now, your Mac is ready to go. Have fun!