well, it sounds like to me that ur signal cable that connects ur moniter to tower cood b bad or not instaled proerly. did u get computer new? if so then the signal cable should b coverd under warranty. if it is used then the moniter cood b bad. also, is the moniter plugnplay? or duz the moniter have its own software/drivers. if it has software, then u might need to configure or reinstall it. but i dont think many moniters have software. so try plugin a workin moniter into ur moniter port on tower. if it works den ur tower is good. if it dont then ur moniter port on tower cood b bad. k?
gil arelano, January 2006
