I have a Windows XP system. I bought a new 24" monitor. I am looking for some option by which I can turn off the monitor when it is not used for 5 minutes. I checked all the settings but not able to find anything related to that. I work on some video editing project. So ample of time I get busy on phone and the system is left turned on. I do not want anyone to touch my system and spoil what I am doing.