I browsed the site for awhile looking for the same issue but couldn't find it. Plus if I search for "benq", nothing comes up, which shouldn't be.
Anyway, heres the problem and what I have tried.
I put any game in and the xbox doesn't recognize the game. You can here the drive run for a moment then stop.
I pulled the drive apart and watched it as the xbox does its pre-test on initial power up. The laser turns on and the disc motor lifts and spins for a moment. I tried cleaning the laser with alcohol, but it didn't work.
So now I need to figure out if it's the laser or the drive's circuit board at fault.
I have very little experience actually diagnosing lasers and such, so any help is greatly appreciated.