"But I have 3 year on-site warranty" you say

For what Dell charge? You must be joking! :-)

We don't bother with the 3 year on-site warranty except for the servers -
one year RTB is fine. For desktops and even laptops it just doesn't make
financial sense. For the occasional system that might fail, then just buy
another one. 2 x new systems in a 50 user site compared to 50 x 3 year
warranty - you do the math :-)

Rob.