Won't play disc, reads no disc

Hi, well I see this type of thing in my Lab alla time unfortunately it sounds if ya DVD has gone faulty... an all too common occurrence these days.. the Laer seem to be very "Frail" You could try a cleaning Disk, but they seldom work.. but sometimes? all ya can do is replace it with another good DVD.. OR if thats not possible use any AV input and connect a remote DVD player that way.. a bit of a hassle, but it's a work around anyway.