Since you're dealing with an Intel-based iMac and not a PPC system I would guess that the install should go fairly smoothly. Mint is easily one of the most user friendly distros, however a little ...
Long story short - I've got my Mum's old iMac which is a Core i5 2500S vintage machine. 12GB RAM, 1TB spinning drive. Still quite a nice unit, screen is still good, so trying to see if we can make use ...