Mac: It could happen to YOU, as well!

How's your backup? It's current, right? Well, let me tell you a story:
It happened during the silent days before Christmas. Life was good. The last backup a couple of days old. Nothing new here. My 12" PowerBook rested next a really noisy SUN-box (with noisy I mean Gee, are we that close to the airport? You get what I mean.). The resting place of my 12" (you notice that I omit the word trusty, do you?) was, as already mentioned, next to that SUN-box. It has been sitting there, peacefully, for about two weeks. To be precise, I sometimes lifted it to my lap (hence the name Laptop) to do some typing, next to the SUN-box, mind you.
While doing a print-run, three days before Christmas, it started to act up. The RAM was maxed out, according to Apple's specs, but some of the programs cannot get enough of it, so I thought that I had taxed it a tad too much. Acting up means that I had to see the Spinning Beachball of Death more often than usual. I closed a couple of programs, we are talking *NIX here, after all, to see if everything else starts to run more smoothly. Things simply got slower. Now I got suspicious. Caches to full? /tmp directory overflowing? I fired up a terminal-session to have a look. I watched the program jumping in the Dock merrily, but no window appeared. I tried to launch Safari, out of curiosity, same thing here. Let's reboot.
It took ages until the PowerBook came up again. A quick check in the /var/log/system.log showed no errors. But it felt different. Something emitted a strange noise. I unplugged the PowerBook to take it someplace else to investigate.

Imagine your favorite suspense music, now!

When I left the room with the SUN-box, the PowerBook emitted a noise similar to a coffee-grinder. It came from the front-left corner of the case (the home of the hard-disk, for non-Mac-users). I placed it on my lap, thus in a slight angle (Laptop remember?), the noise intensified. I tried to hold it straight, the noise changed, but did not disappear. Neither Terminal nor Console displayed any errors, none, zilch, nada. Enough joking around, reboot to Verbose Mode, this mode, in a nutshell, makes OS X behave like any other *NIX system, means you get a lot of diagnostic messages. Nothing to see here. Still grinding. All right, Single User Mode. No errors reported, according to the logs. What is going on?
I rebooted the system using the DVD, DiskUtil told me, that I am not in possession of a hard-disk, great. I mean, it made its presence heard, believe you me! I zapped the PRAM, booted from DVD again and, tadaaaa, a hard-disk. You guessed it, noise but WITHOUT ERRORS.
According to Apple - Support - Discussions - PowerBook G4 12-inch I'm not alone, not that I felt better, though.
I bought a Mac mini to have a backup system and I will try to repair my 12", giving it a chance to earn trusty again.
To be fair, it helped me in the writing of three books and a lot of consulting stuff, but it was always treated with respect.
I'll keep you posted.