For improve the service and build up the standardization, we state what task we carry on IT OutSource Services and give suggestion what you need to attend. The services most divide in 2 parts, routine and ad-hoc, and those services can run on remote or on site. That will be depend on what symptoms, the easy way to identity need to remote or on site, that will depend can the system is that switch on? Unless the system is infect virus, the most situation can use the remote services to solve out the problem. If the system is hardware failure or cannot switch on, the only way is require on site services to carry diagnose which hardware part has the problem.