Computer Troubles -- I doesn't has 'em

I completely forgot to post about this -- I found the source of my computer vibration. It's my external hard drive, which is sitting on the plastic lid of a coffee container I have on my worktable. The lid plus container make a wonderful natural amplifier, and when the drive has been on for awhile it vibrates just the teeniest bit.

So I'm only turning it on when I am doing backup, and I'll replace it with another one someday soon.