Microsoft Knowledge Base Article 320040 contains the following summary:

This step-by-step article describes how to use the debug version of (Ntdetect.chk) to help you to identify hardware problems that may prevent your computer from starting.

If you are experiencing problems starting your computer because of a hardware problem, you can use Ntdetect.chk to determine the hardware component that may be causing the problem. Ntdetect.chk is located in the file from the Windows 2000 Resource Kit companion compact disc (CD). Open the file, and then extract the Ntdetect.chk file.