My NEC ND-3540A doesn't recognise DVD-R

it is strange that recently my 3540A cannot recognize any burnt DVD-R…

situation is like:…

when burning DVD+R with it: disc can be read on OTHER computer
and can be read on itself

when burning DVD-r: empty DVD-r is recognized as an empty one (as supposed)
disc burnt can be read on OTHER computer
but when read on itself, windows browser show sth like ‘not supported format’…
NERO infotool show a DVD-ROM of 0.00GB capacity…

i tried 1.04firmware and LD-3540 1.WB one… no luck…

( running winXp SP2, nero 6.6.0.8, now is nero 7.8… )

IS IT TIME FOR ME TO GET ANOTHER NEW DRIVE…?

See http://club.cdfreaks.com/f86/nec-optiarc-dvd-r-reading-problems-209168/ for details on this common NEC drive problem.