I have a older Lit-On BR/DVD combo burner with lightscribe (iHB212). I was working on a home BR movie using Avid Studio. When I went to burn a disc using a BR disc the burner didn't see the disc. Tried everything I could think of. No luck with burning. I then tried a DVD+R disc and that worked. Is it possible that the BR burning part died? But still able to burn a DVD disc? Are there two laser beams or just one? I am a average user and my tech level is that.