Hi everyone, My iMac hard-drive always spins down and then spins-up, whenever theirs a major disk access. I have also disabled the Energy Saver option of Spinning down the HDD. Everytime i run the Disk Utility First Aid, the hdd always spins down and up continuously until the First Aid crashes. Any Suggestions as to the reasons? Is this a failing Hard Drive ? Or can this be a failing Power Supply or Logic Board ?