G5 SONY DVD RW DW-U21A DVD-R Media Problem

hello all,

i have a G5 with a SONY DVD RW DW-U21A writer and its not possible for me now to burn DVD-R Discs.

I've tried following media which all doesn't work, not with toast 7.1, not with the Finders Burn utillity.

- blue TDK 1-16x (mediacode: TH002)
- verbatim certified 16x, printable (mediacode: MCC 03RG20)
- sony football edition, AccuCORE (mediacode: SONY16D1)

i spend over 130EUR to buy those media, only the old light blue TDK 1-8x media (mediacode: TTG02) which i've bought last year seems to work fine, but those media type is sold out.

but i have tried ALL those mediatypes on my G5 at work (pioneer DVR-106) and it worked!!!!!

i can't belive it!

i want a working DVD writer!