Optical drive no longer mounts blanks after erasing dvd-rw

hi, hopefully someone can help with this -
new macbook pro (couple months old)
i've used the optical drive twice, to burn onto a couple maxell dvd+rw discs - this worked fine.
today, i put one of the discs i'd previously used in, hit "erase" in disk utility ...
since then, the drive won't mount or recognize any blank media ... (the drive just hums for a bit, then nothing)
i tried the erased DVD-RW disc in another mac, it mounted fine - so the problem's not the discs ....
the optical drive seems to mount old data DVD-R's, authored DVDs, and CD's just fine ... but it now won't mount any blank media at all (whether CD-R, DVD-RW, or DVD-R)
weird - it's like erasing a DVD+RW has somehow wiped the drive's ability to mount fresh, blank discs...
is it possible the erase operation busted something in the drive ... maybe that kind of operation uses part of the hardware mechanism that only affects the reading of blank media ? or could this be a software problem?
i tried resetting pram and repairing perms, this had no effect.
here's the spec of the optical drive :
MATSHITA DVD-R UJ-875:
Firmware Revision: DA09
Interconnect: ATAPI
Burn Support: Yes (Apple Shipping Drive)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -R DL, -RW, +R, +R DL, +RW
Write Strategies: CD-TAO, CD-SAO, DVD-DAO
Media: Insert media and refresh to show available burn speeds

ok, just to add to this -
i made a small install of OSX.5.2 (from the MBP install disc) on a FW drive, and booted from that - and lo and behold, blank media is recognized ...
... so this points to a software problem ...

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This question was solved.
View Solution.

Hi,
Please try Run now from the following link:
http://support.microsoft.com/mats/cd_dvd_drive_problems/en-us
also check the following methods:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01895589&tmp_task=solveCategory&lc=en&dlc=en&cc...
Regards.
BH
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Optical drive no longer mounts blanks after erasing dvd-rw

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