What does it mean that my DVD player can't read discs it tries to load but eventually says No disc?

Either your disc is scratched or you have a dirty DVD player. Just open it up and blow lightly into the DVD player. No spit. Nothing. Just blow lightly and the dust will be gone. And to wash your disc just take some cotton and gently rub it all over the disc. and if it still doent work. Are you sure its a DVD disc?