Comment by PlunderBunny

I remember when the hard drive on my PowerMac 7200/90 started to fail (I was told that some of the ball bearings the platter rotated on were broken [0]). When the drive detected a 'wobble' on the platter, the entire computer would just power down with no warning at all - it was like the sound of a vacuum cleaner powering off. Silence and a blank screen that looked like a power cut, followed by that "oh sh!t" moment.

0. Note sure how true this was!