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Ticking or clicking sounds are usually early warning signs of hard disk failure.
First, backup your entire computer; OS, data. Then do a cloning operation on the hard disk and replace the hard disk with the newly cloned disk.
Use Apricorn's Drivewire for cloning. It is simple to use and effective.http://www.apricorn.com/products/notebook-hard-drive-upgrade-kits/drivewire-ide-pata-sata-to-usb-hdd-adapter.html