I was using My TV as my secondary monitor.Suddenly, I am not able to use TV as my secondary,since the Settings tab in Display properties screen do not show two monitors.It is showing properties of only one monitor (Plug and play) .How I can I restore the Display properties screen as it was before?I am using nvidia 128 Mb graphics card-P4-2.8 Ghz-512 mb ram-winxp pro.