Actually I've had a few problems with my mac over the years. (Dual 1ghz G4 Quicksilver)

The three biggies are listed below. I have had other problems they were caused by me ;)

1. One of the processors went bad and it sat at an apple authorized repair center for a month while they trouble shot. (I told them it was a processor when i brought it in but you know how that goes. I did my own trouble shooting. They ended up changing the motherboard, modem, ram and wire harnesses before they changed the processors.)

2. I have had random problems with firewire. I thought i lost it completely a couple weeks ago so i went out and bought a fw pci card. after plugging it in and getting it all set up... the built in started working again. - there when $50)

3. One of my ram slots wont recognize ram any more. I tired different ram but I cant figure out if its a bad stick or a bad slot. ( i don't care much anymore becasue i don't have time to play with Shade or Poser much right now. And I have been planning on buying a new pro tower for some time. Actually i was about to get a G5 when they announced the switch.)

Then again I haven't had a lick of trouble with my wifes 867 Ti Book. Even the battery is still over 87% of original capacity when fully charged.
Soooo... As with all electronics YMMV. (As stated by Kaveman. (Hey do you have Geiko insurance?))