hi there m8. It's not a hardware config issue in any case. I had the same "problem". Just make a reflash and you are good to go!!!
I installed 2.16 version from dangerous brothers, since Herrie's firmware already distroyed 2 of my drives.... Get it here: http://tdb.rpc1.org/
-search for it in the list-
(i would post a direct download link, but offsite linking is not supported)... and there is a windows flasher in it, to make flashing easier...
You can also try the MadDog firmware that support DVD+R SL and DL, and DVD+RW Book Type... Again, you can get it here: http://tdb.rpc1.org/
If you need any more info, you know what to do!