Help! NEC 3540A suddenly doesn't read CDs anymore

I bought this NEC 3540A from newegg a few month ago. Today I was burning a CD-r disk with Nero 7 demo. Only when it started to burn did I realize that i was burning the wrong file. So in the panic I clicked “Abort”. Nero aborted the task. And ever after that the drive won’t recognize any CD or CD-R. When CDs are inserted, it shows no change in icon or anything in “My Computer”. But the weird thing is that it reads and writes any DVD media fine.
Does anyone know what the problem might be? Thanks in advance. :confused: