Samsung DVD player when disc put in aft...

it can be two possibilities. 1)either the disk is faulty.check out in another player or drive and confirm whether the disk is properly working. 2)or the lens in the drive which reads the disk is either faulty or got dusty.in the electronics shop you get lens cleaning cd.insert that in your drive and play it.it will spin for a period of time and stop.then insert your dvd disk and check out if the same problem.then drive inner lens is faulty and needs replacement.