Desktops
Replacing a power supply
Adding Memory
Replace or upgrade Video card
Laptops
Replace cooling Fans
Replace Monitors
Replace Video card (on models that have changeable cards)
Replace CD /DVD drives
Replace Hard drives and reload windows
Installing Software and Printers
Data Recovery (some times not all data can be recovered )
Virus and Spyware Removal
Networking LAN , Wireless, and Printers
And much more.