I have a TP750NLG 17″ Monitor.

Upon booting the monitor displays characters until i see the delete to enter settings. It goes blank and display comes up again when the main windows screen is up. If i press display at delete stage to enter settings it dosent give me the settings screen .So i cannot enter settings screen at all. I changed to another monitor it works fine. no problem. What is wrong with this monitoe please help.
Jonathan