DVD Rom Reading Problem

I’ve got a Gigabyte DVD Reader 16x. Something is causing the problem in reading DVDs. On the other side upon inserting regular CD it seems that the reading problem disappears…Is there anybody willing to help in solving the problem with a DVD reader who doesn’t read DVDs and in the same time reads CDs? I’ve tried to clean a laser but it didn’t help.

Then the dvd part is probably dead.