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 ...

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.

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A bad system config error on a Windows machine can stop you dead in your tracks. Here are some things to try to troubleshoot and fix the pesky issue.