Sony DVD RW DRU-710A

Ever since i cancelled a cd burning project and ended nero becuase the computer froze, my sony dvd/cd burner won't work anymore... It can't read anything except for dvd that has something in it (i.e. dvd movies) .. It cant read music cd's, file cd's, blank cd's or dvd's it just wont read it... it wud glow green to let u know that its trying to read it but it cant... the computer doesnt show any information about the disc i put in... pls help me solve this problem