iMac display options florfed

My wife has a 24-inch iMac, Late 2006 model. Until recently, Displays gave an option for several screen sizes — like Goldilocks’ porridge, one was too big (type too small for her to read), one was too small (type too big), and one just right.

Recently — I think after the last software update (she’s running Lion 10.7.4) the good one disappeared. She now has only two choices for resolution — 1920 x 1200 (which makes the type too small for her to conveniently read) and 960 x 600 (which makes everything much too big).

Anyone have any ideas about how to get the good resolution back? There should be more choices than this ...

-Lofty