MacBook Hanging Up On Grey Apple Screen

I have a problem with a MacBook that I bought in late August. I turned the computer off this morning, and when I turned it on again two hours later, I noticed that it was very slow. It took a long time to start up, the desktop took several minutes to appear, and then automatic log-in applications took another few minutes. I restarted it again, hoping to fix the problem, but now my computer completely hangs up.
The chime goes off, and the light grey screen appears, as well as the apple. The spinning thing at the bottom comes up, and nothing else happens. Even after an hour, the computer still makes its "thinking" noises. Not the loud, grating dead-hardrive noise (I don't think) just the normal one.
I have no idea why this is happening. I've installed nothing new, deleted nothing, or made any big changes. Well, I just moved to England, but I've used the correct power adapter. I don't think that would be the issue.
Oh dear, in the middle of typing this I am hearing a very bad noise. It almost sounds like something in there is clicking. It's hard to tell where it's coming from, but it sounds like two things are rubbing up together, but something is catching and causing that click. I don't think that's a good sign.
I do not have my repair disks with me, unfortunately. I cannot start in safe mode, it hangs up here, too. I've reset the PRAM. I attempted to start up by CD with the AppleCare CD, just to see if I could. I got what I expected, nothing. I'm assuming it's a harddrive problem.
Any help will be very appreciated. Thank you.

I'm replying to this in case anyone else searches with a similar problem. Directly after I wrote that message, I tried to start it up again, and was greeted by everyone's favorite question-mark folder icon flashing on the screen. The Geniuses couldn't do anything with it, including startup with an external drive, and my hard drive has been replaced.
Back up your stuff, folks.

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