HP 740b Burner gone awry!

I got a HP 740b Lightscribe DVD Burner(Firmware revision HJ24,upgraded recently).Tried to read a DVD-R with an open session on it(also another DVD-R which was badly burnt).After that,it just doesn’t recognize any DVD media I put in!!!I tried uninstalling aand re-installing the drive from within Windows SP2,but to no avail.It still reads Cds just fine.HELP!!!

Test the drive in another computer.

Did you resolve your problem, I am currently having the same problem.