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Use a cd cleaner to clean the lens and then see to it the firmware is upto date. Apart from this try out with different variety of cd's and dvd's too. If both cd and dvd is not detecting then ur lens could be the fault. And it is not worth replacing lens for a Internal drive, but u can give it a try with the local stores.
It is possible there is a bottle neck in your system stopping it from allowing the dvd to play.
The DVD drive is only one part of it. There is the cable to the motherboard, CPU load, memory load, Video card being used etc.
If the drive is connected to another DVD/CD drive on the same cable, try unplugging it first and see if it improves. Also if it is running on the same cable as a hard drive, your main hard drive in particular, then try to get it onto it's own cable.
Check the software running it is not in software mode using it's particular config section within the program as well. If your video card supports hardware mode for video playback, then that will reduce system power being used by the CPU and the memory systems.