Can write dvd but not cd

hi frnds
in my computer i can write dvd’s but can’t write cd’s .i have warranty.please try to help me

Bring it back. I had this problem, it was a broken pin on the header pins, on the Drive itself. You may have inadvertently broken a pin. (Which may not be covered by warranty). If it is a broken pin, you can easily solder a new one in if you are mechanically inclined. I think you want this post to be in the Hardware section.