There's firmware 1.04 (AD-7173 P-ATA in that page) available for your burner. Remove any disc and close the tray before updating. Reboot after it has finished. You might also want to try the other available burning speeds.
If it still doesn't work, try with Verbatim or Taiyo Yuden blanks
Im really thankful for your advice.
I downloaded the firmware and tried to update but it says Update Failed and no other helping info. I didn't have any medium in the drive and had previously rebooted so no other application was running when I tried to flash the drive.
You don't think that maybe I should try with the S-ATA firmware instead?
I could of course try with Verbatim media etc but I also tried burned DVDs and pressed music-CDs and they dont work either.
-neo-