technical support services, namely, troubleshooting in the nature of the repair of computer hardware; installation, maintenance and repair of computer hardware; installation and maintenance of computer hardware systems; technical consulting services in the field of computer hardware installation; installation, maintenance and repair of computer printers; refilling of toner cartridges; installation of audiovisual equipment; advisory services relating to the installation of audiovisual equipment; cable laying services; technical consulting services in the field of computer hardware support, namely, installation and maintenance of hardware; information technology consulting services relating to installation, maintenance and repair of computer hardware