We have all the necessary cables and power cords here. We do on-site service for most repairs. In most cases we'll be able to be there by the next day. Some problems aren't cost effective to fix on-site. If you're computer is locking up intermittently, it would be too expensive to have a technician there all day waiting for the problem to occur.
Billing begins as soon as the technician leaves the building and ends when the problem is solved.