Even if it was repairable it would cost more to fix it that it costs to replace, as DVD writers start at Â£19.99 here in the UK anyway. Different hardware as an example, my printer cost me Â£60, to replace the printhead would cost me Â£130 for parts and labour. It is generally the smae principle, most PC items are designed for disposal not repair.
As alan has said if it is still under waranty return it for an exchange. If a disc is still stuck in the drive to get it out there should be a small hole on the front. Straighten out a paper clip and insert it in the hole and push this will release the draw to allow you to remove any media inside.