Weirdly, I fixed by plugging in a bootable USB drive, and setting the order (in the BIOS) to
1. DVD
2. USB
3. HDD
When it's set to
1. DVD
2. HDD
3. USB,
then it boots to Windows (on the HDD) and tells me Windows is broken (whether or not there's a bootable USB drive plugged in).
Thanks for your help! Is there something I need to click to indicate "problem solved"?
Thanks,
MT