This is a test of commonsense. Complete the next sentence:

How to change an imac hard drive
Backup your imac.
Before changing the drive on your computer, you should always backup your hard drive. You can backup your drive to a cloud service like icloud, or google drive, or you can backup your data to an external hard drive or flash drive.
Power off your imac and unplug it. You should always make sure your computer is unplugged and place it on a clean, static free surface.