Is my CD drive bad or did MS SP2 do it?

Hi everyone, This is my first post so please bear with me.
My CD-RW\DVD drive has disappeared from my Device manager. This happened right after I installed MS SP2 on my notebook. The drive light flashes and spins when I insert a CD, but nothing happens. Not even a error message. It is a Quanta Storage SBW-241 on a HP ze4420us. Do I need a new drive?