pollster

I have a number of Geovision systems installed primarily on Dell GX270 SFF machines. Problem is with both bad capacitors and other power or internet related issues, these systems periodically go off line. And since I only log into these systems when a customer calls needing me to retrieve video, I am discouraged to find the system has been off line for days or weeks. Does anyone have any suggestions on how to monitor these machines so I am notified if they go off line? Thanks, Ken