Hi again everyone,
I was able to get the resolution up to 2560 x 1600 but everything was very fuzzy. I only use the monitor for text and numbers 90% of the time. No gaming.
I have set the resolution back to 1200 x 800, which is not great, but at least everything is legible.
Might the problem be the cable?
I had a similar issue with the same monitor about 8 years ago (maybe the monitor is too old!!!) but it was quite far from the computer (10') and changing the cable fixed the problem.
Thanks for any help