Steps:
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a) Create the bootable USB drive with Yosemite
(i) Format the USB drive with GUID Partition
(ii) Download Yosemite from AppStore and quit the installer.
(iii) Type the below command on MacOS Terminal
sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction
b) Restart the Macbook and boot from USB Drive
c) Format / Repair Disk the main HDD
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