PLEASE HELP WITH CD PROBLEM :confused:

I have been playing diablo II LOD for a while and have been using this same CD for a few months (lost first one) its always worked fine duntil yesterday nothing was wrong...

now suddenly my cd drive doesn't detect the d2 cd!!! its just the d2 cd because every other cd works!!!

im thinking its a problem with the cd but how can that happen??? never dropped or had anyway of scratching it and since its fairly new it looks in great condition...

before contacting the supplier do you know anything i can do to mabe fix it??? thank you!!