my mac keeps ejecting blank dvds. it plays pre-recorded and burned cds, and pre-recorded dvds (no burnded dvds 2 test). it wont even mount them. it jus spins then ejects it after a few moments. according to system profiler i have pioneer dvd-rw dvr-103. my firmware is 1.49 . i believe it was shipped this way (superdrive) because it says under "burn support" it says "yes (apple shipped/supported)" is anyone familiar w/this problem and/or have a solution?