Computer service technicians' duties and responsibilities vary from one position to another but, in general, they:

• inspect and connect new equipment
• configure systems and install/update systems and applications software
• install and configure security software such as firewalls and anti-virus tools 
• install, configure and troubleshoot Internet connections
• connect computers to wired and wireless local area networks
• test new systems to ensure that they are in working order
• respond to customer complaints and provide technical advice
• diagnose and troubleshoot hardware and related software problems
• install circuit boards and peripherals
• keep records of maintenance work and repairs
• analyze customer equipment performance records.

Working with customer support analysts, computer service technicians may field test new equipment and report results to engineering and manufacturing personnel.

Computer service technicians work in surroundings that may vary from clean and well-ventilated to cold and dusty. They may be required to lift and carry computer components weighing up to 40 kilograms.

Technicians usually work a standard work week but may be on 24-hour call for specified periods and work overtime when systems malfunction. The work can be stressful when systems are not working properly and customers are upset.