Problem in SONY DVD RW AW-G170A

I have a problem in SONY DVD RW AW-G170A.when iam placing a cd/dvd in drive cd/dvd was not detected…When i double click on it drive there was a blank page even if cd/dvd was placed…what might be the problem…i think the lens of the drive might get dusted it it right??or is there any other problem??