monitor or tv? anyway...let us see:
1. do you see picture if monitor is connected? via vga, dvi or hdmi cable to pc?
2. do you see picture on tv without pc connected (just normal tv programs?)
3. do you see picture if you connect any other pc or laptop to tv/monitor?
4. did you try with windows+p keys to switch between modes?
5. what happens if you have picture on monitor only and then plug the hdmi cable to tv?