The other day my CC suddenly started making a loud whining noise which sounded like a failing HDD bearing, so I powered it off and replaced the HDD. However, the noise is still there, accompanied by an odd odor. Apart from these two symptoms, the CC appears to be operating normally.
I don't believe the noise is the case fan, which means it's probably coming from some electronic component. As mentioned, everything seems to be operating normally, so I'm baffled - does anyone have any idea what this might be?