At one site where I worked we had somewhere between 20 and 30 Dell Optiplex desktops breaking down due to this http://www.badcaps.net/pages.php?vid=4
Every time a skilled technician (InfoCare business support in Norway) would arrive within the time frame specified in the support contract, change the motherboard and make sure everything worked smoothly.
Well here a lot of my friends had problems with Powerbooks and simply abysmal service from Apple, while Dell Norway for us was impeccable on several occasions. Can be just a regional thing.
I had a Dell with a faulty touchpad - it took 12 TWELVE onsite visits to fix it. That included 2 visits where the tech had been given the wrong part and 2 to replace parts that had been broken by the previous tech.
Every visit was a new person, none of them knew that the part they were swapping had already been swapped 6times before - until finally they stopped swapping the touchpad and replaced the motherboard.
But the info that this release MB was faulty was all over the net - it was only Dell that was unaware of it.