Pioneer 107 does not recognise blank disks

When I place blank disks (ritex - disks I have been burning to before succesfully using Nero) in the drive it does not recognise them. However when i put a pre-burned dvd in the drive its does no problem.

I tryed the firmware update and still no luck. It my computer seems to crash when i put blank discs and sometimes burned disks in it
How can i fix this?

A firmware flash is not the way to fix hardware related problems, ever.

Either the lens is unclean, dejusted or plain dead.