Since you ask, I am going to assumed that you will be taken it to a repair shop. My guess is that you won't be able to do it for under $10 (if it is something obvious and simple) and really hurting for business. But who knows..give it a shot
My Dell laptop has been used some years, and it seems something wrong with the laptop ac adapter, so I bought a new Dell PA-12 AC Adapter from http://www.papatek.com/Dell-Adapter/Dell-PA-12-AC-Adapter-19.5V-3.34A.html , the new one is good, but I still want to know, if the old one can be repaired, who can give some advice? Thanks.