Reading CD-R's NEC ND 3520A




When i insert a CD-R into my NEC ND 3520A it doesnt read the disc i.e if its data or audio. When i use nero to try and burn to a CD-R it prompts me and says there is no media in the drive and please insert a disc when one is already in the drive. I have tried two different types of CD-R’s and both produced teh same results. I may have only used it once to burn to a CD-R, and DVD’s burn and read without any problems. I was advised that there are two lasers within the drive and one that reads the CD-R’s may be faulty could someone please advise

Many thanks