Ok, well today I opened my MacBook from sleep and it wasn't turning on. I waited like 5 minutes and nothing happened, so I turned it off and tried turning it back on. Instead of the usual sound (not the one from the speakers) of the hard drive or something turning on, I hear it attempting to turn on, like it was disfunctioning or something. I turned it on and off multiple times until it finally worked. Now that the machine is on, it's moving at it's usual quick speed, and you would never notice it had any problems. Should I be worried or just let it go?