Problem with Monitor

Hi, hope someone can assist me.I got a problem with a TFT monitor which is showing a troubled image for 30 minutes after pc start, then works fine, and image is garbled again for 10 minutes or more. Some days it works fine for nine hours or more with the same issue on startup.Understand that I could just replace the monitor, but before doing that, would like to know someone's opinion.The problem just started to happen some weeks after I have deleted most of my background window services in order to take most advantage of my low-end pc (1.7ghz). I also deleted some of the startup background services.Could it impact on monitor work ? Could power supply be an issue here (some of window background services are power supply control).Many thanks for your advice and for understanding my english (I am swiss and speaks french and this kind of problem is not easy to explain)RegardsPatrick Geneva, SwitzerlandCould someone tell me if some of the background window services could impact of proper motior As this has happened just us u,m,mmy fot, as o