Common Faults:-
Every system is unique, and has different hardware and software installed on them. There are many problems all depends on the hardware and software you use, in many cases depends on how you use i.e. what websites you visit, how hard you press keyboard, keep something and close the laptop, liquid spillage etc. etc.
Some common problems:
1. System Crash
2. No Display or Broken Screen
3. Hard Disk not found
4. Virus and Spyware Infection
5. Some keys do not respond
6. CD / DVD not working