Help SOLVED recommended mode 1280×1024 :D

This is what has happened to my 17″ Samsung 713n not optimum mode recommended mode 1280×1024

Here is a good insight into what is happening. Thanks to paras7664 for the detail.

This monitor is no longer under warranty and I am sure that it can be repaired I just need to know how to do it. It is my first LCD and has performed really well until now. 😉