But at least I know the problems with the DVD drive are software-based and not the hardware problem I assumed. Although I'm not really sure it's an improvement, since all of Google's suggestions seem to involved either editing the registry, which I already did, or deleting and reinstalling the drivers via Device Manager, which I can't do because Device Manager doesn't have an option for DVD drive.
(The drive works until Windows starts. I can see it in BIOS, and boot from the recovery disks. But once Windows is in play, my DVD drive disappears. It's a little puzzling, really.)
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