I am V E R Y sure I have a DVD writer and not a combi - ive built enough systems in my time to know the difference between them!!!! Anyway, I asked u lot ur advice because it was a problem that had no logical answer!!!! I tried EVERYTHING possible, and it still doesnt work in my new system....no reason why! Ive put the writer (TSS H225B 16x Dual layer) back into my old system that I've already sold and it works fine! My new writer that I recieved yesterday works in my new system fine!!!!! It turns out that my old writer just doesnt like my new pc!! Crazy, but true! Lastly, apokalipse, thanks for quoting myself to myself.....that was a HUGE help, but seriously thanks to everyone else for their input.