Thanks so much everyone. Your detailed insight is very helpful.
I have a 6 year old base iMac (white) and there is a thin red line running vertically. This happened within a year and a half of owning it.
I'm am afraid if I get this Mac mini with the same type of integrated graphics card as my old imac, then it might fail, with NO chance of repair.
I might just buy the new 27In iMac (higher end) and not have to worry about the integrated card.