LG GSA 4160B Won't burn




I have searched the forum and couldnt find an answer so here goes…
Will burn cdr but not dvd. Latest firmware installed 304, keeps asking for a blank disc every time i try and burn something!!! The crazy thing is it did work but just stopped. Everytime i try anything dvd related whatever programme i try to use the pc locks up. Tried Nero and Clone 2. When it did work i was using Diva - r 4X. have since tried TDK and Maxell with no joy. Any ideas anybody? :confused: