I have asked around and no one seems to have an answer. When I boot up I can hear the hard drive. I will get my desktop screen, but if I try to open anything it stalls. After about 2-3 min the hard drive kicks in and it occasionally knocks and sounds louder than usual. I have even reformatted the hard drive hoping that this would help. My computer is less than 2 years old and this started about 6 months ago. Should I go out and get a new drive or is something else causing it???