iTunes will not burn an audio cd on my iMac G5 rev. B. I can burn a data cd from the Finder in Tiger 10.4, but iTunes will give me one of two error messages when burning an audio cd: "laser power level failed to calibrate to the media" or "medium write error" I have repaired permissions, deleted iTunes preferences, tried every burn speed, iTunes is set to audio cd burning, and I tried to use a new user account. The cds are Sony, and I have used them in the past, plus they work with Finder burning. I can also burn DVD's. Anyone have any ideas to fix this.