intrusion

My pc is in shutdown status. and i am not in my home(SAY OFFICE). Now if someone starts up my pc and breaks the password somehow and logs in, i want to be alerted immediately by a SMS in my mobile that intrusion happens. Any idea how to do that?

I bought this mobo last week. It has chassis intrusion detection system and this system displays a fatal error stating that chassis intrusion detected. I know the use of this system so dont explain all those stuffs. Pls give me a solution. There is no info abt this in the manual...

Hai friends I am doing M.Tech in Information Security ,I am willing to do a paper presention in Intrusion detection system(IDS).So pls friends help me,refer some site names and view u ideas about the Ids.