LG External Super Multi DVD ReWriter 6SA-2166D - Not Writing

Hi

Until recently my LG DVD rewriter used to burn DVD 4.7 GB disk with no probs. But off late it is refusing. The error is after the movie has been converted into relevant format by Nero or whatever software for playing with DVD player, the writer is repeteadly asking me to insert blank disc (which i do) and the stupid writer doesn’t seems to be recognize this.

Can somebody help me, pls

Tks

No responses? ugh!