After about three months of owning an Antec 902 and having it be relatively quiet, the top fan on my case has developed sort of a ticking noise. The noise isn't very loud but it really does get on my nerves. Has anyone else had this problem or have any idea on how I can fix it? I really don't want to resort to unplugging the beastly fan. I've found that if I put a folder over half the fan, the noise goes away, so I've pretty much pinpointed the location of the noise.