GSA-4163B won't burn

Hi people!

I’ve had an GSA-4163B for about a year, I think, and it never gave me any problems until a couple of months ago. When I am trying to burn something with Nero (and I’ve tried versions 6 and 7) It won’t recognize any DVD +/-RW - keeps giving me a message of “waiting for drive to be ready”.

It does, however, read any DVD RW. Today, it started doing the same thing to some TDK DVD+R I bought.

Has this occurred before to someone around here? If so, what was the solution?

Thanks in advance for any help you might provide.