Last night it froze up, so I turned it off by holding down the power button. And now when I try to turn it on, sometimes it only get to the grey screen, sometimes it gets to the grey screen with the apple, sometimes it gets to the apple screen with a little gear turning thing. Once it showed a folder with the Mac sign, the one with the face in blue and gray. And it would switch from the face to a question mark. And last but not least, once It turned all the way on, and I opened HD, so it was actually on. It makes a clicking noise whenever it's on too. I really need this computer to be fixed, and I have no idea what's wrong with it. I'm hoping it's some small problem, that I can fix. Please Help Me!