Dvd burn stoped work and i dont know why

hello i have n clue y the dvd burner is not working on our modoem we only have one cd intrery and it says on it cd/dvd rom and when i bought the computer they said that the dvd burner was built in to it but i have never need to use it till now well i called the tech and they said that it was a problem in my hard drive and that my computer was no longer under warnty so if i wonted the help i have to pay 100 dollers for them to fix it and i dont have that kind of money so if its something some one can help me with or knows any thing about it please please help :doh: because i am stuck thanks so much victoria

What OS are you on; XP,Vista,98 ??

Do you know how to find the “Device Manager” ??
Exactly how does it describe your drive ?? All letters and numbers…

What is the Computer you are running ?? All names and numbers…