Quicksilver case buzzing & humming

Hello All,
Since installing a second internal HD the other week (specs below), the case has been making a buzzing/humming noise. Both HDs check out as okay re: SMART Status; it’s not apparently related to HD spin-up or anything similar.
I’ve found that the noise level diminishes if the top and/or side covers are pressed down/in, but does not altogether go away.
Additionally, the buzzing/humming greatly increases if a software CD is in the optical drive.
It really does sound like a loose panel… or maybe the fan is wobbly at the power supply and causing these vibrations?
I’m hoping that the problem was initiated by the action of lifting the computer up from under the desk where it has sat for the last six years, which may have caused some sort of ‘flexing’ or dis-alignment in the case or nearby hardware item, and which hopefully can be fixed by tightening screws in the panels or reseating the optical drive/power supply box.
I’ve found the KB document for replacing the optical drive (just want to remove and reseat), but can find nothing here about reseating the power supply box or the left-side and top panels.
Questions:
1. If anyone else has encountered this, how was it resolved?
2. What are the precautions for reseating the power supply box and left-side and top panels?
Any other suggestions gratefully accepted.
Cheers,
Dennis

Hi-
Since this began after the hard drive installation, I would start there. It may be that the carrier tabs didn't fit into the floor of the case properly, allowing vibration from the drive. Insure the drive is properly attached to the carrier as well.
I would highly doubt that the PSU is loose, as it is attached by an internal bracket to the rear of the optical drive carrier, and from the outside by three screws. Check for looseness, but "reseating" shouldn't be necessary.
The left side panel is held by four screws externally, and connected to the steel case in the center of the Apple. To access the clip for the center mount, the case fan should be removed to allow access from the interior of the tower.
I would check that the case fan and shroud are not loose, or mis-seated.
The top panel requires the top handles and the face panel to be removed. the panel then slides forward and lifts off. The top panel has a loose fit, so reseating will most likely not accomplish anything.
It would be best to locate the rotating mechanical device that is causing the vibration.
Fans and housings, hard drives and carriers, and optical drive would be the items to thoroughly investigate.
Though the case decorative panels may be making the noise, they are not the cause. They are all, with the exception of the rear panel and I/O port surround, by design, loose fit. Your intentions are good, but the real culprit is still in there......somewhere.

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