All the dust in the room or u a smoker?It went in ur tv DVD drive and ditry up the laser eye len,that why it not reading the DVD disc and detecting it.U have some machanical stills,take the tv aparts.Take some Q tips dip it in rubbing alchahol clean the laser eye len.The tv DVD drive will detect and read ur DVD disc again.

The Clicking sound happens, when the lens which reads the cd's,dvd's move off from its original position, this happens when the particular equipment is moved or pushed. In some rare cases, when you insert a very scratched cd, dvd. This can be solved by the particular tv company technicians, or else your warranty will be void.

Try checking whether the lens works perfectly, by playing different kinds of content ( audio cd, mp3, dvd ) etc... If any works, then your lens is working perfect. Later, try cleaning the lens using the " cd lens cleaner kit ". It will be available in any computer accessories related shop.

Thank You.