I have just spent 5 hours replacing my hard drive.
Now I am downloading updates to five zillion things.
I am geek, hear me roar.
This is what I was doing to my precious, beloved little Powerbook G4, whose Airport card I've done, and RAM I did, and I don't remember what else, and I really really could not bear to hand it over to strangers so had to do it myself but needed to wait until I had an unlimited amount of time available and sufficient nerve:
My sweet little machine no longer makes alarming "boing" noises when it tries to start up. Of course, I'll have to transfer a huge amount of stuff from my external backup drive, but hey, I got nothin' but time, right? Of course right.