Hmmm i just finished cleaning out my whole computer area that meant i unplugged everything and gave it all a nice dust down. Anyway i plugged everything up and off it went a couple of minutes in my drive was making an unordinary loud buzz sound every couple of minutes or so. It stopped for about an hour so i didn't think much of it but then again just a moment ago it done it again

I am assuming it is the Hard Drive. Any ideas what could be the problem?

I didn't drop, bump or even open the computer case. Just gave the case and other computer components a dust down.