Whenever I go to put my Macbook to sleep, either by closing the lid or manually pressing the sleep button, the HDD or optical drive makes a double-click noise and the screen either turns back on (if the book is open) or flashes and turns back off if the book is closed. Additionally, if the book is closed, this continues into infinity. Whenever the sleep indicator light fades all the way out, the clicks occur and the Macbook wakes up. Should I be worried? Is this a potential problem for the display and/or any other components? Would it warrant a return? Thanks in advance for your help!