I bought a new monitor and all worked after I blew the inside of my computer out with a dustbuster, as it was LOADED with dust. So perhaps the issues I was having (only in the 1152 x 768 res) was monitor and dust related. I say dust related as the monitor would not work the first time I plugged it into my computer.
However what I do not understand is why my iBook and my Compaq PC Laptop worked fine when I attached that monitor to these laptops. However neither of these are capable of going to the 1152 x 768 res, so perhaps this explains the problem.
John