EDIT: It did - changing that setting back to "AHCI" resulted in a, "This operating system failed to start", message when I tried to boot XP. Changing the BIOS back to the "IDE" setting didn't fix ...

While booting a Hyper-V virtual machine, if you get No operating system was loaded error, this guide will help you fix the issue.

If you see Error 1962, No operating system found, Press any key to repeat boot sequence when you start your Lenovo computer, see this post.