Faulty dvd burner/reader

Hello,
Please help
I have a relativly new i-mac, just past 90 days, and the DVd burner has started to reject discs. It is an: OPTIARC DVD RW AD-5630A. It takes in the disc but then immediately rejects the disc.
Can any one help?

1horn100

I would take it to an apple store and let them fix it (it is under warranty I assume)

Thanks Louishen,
I was hoping to avoid carrying this large screen all the way back to the shop. thought there may be an easy fix.
1horn100