What does a POST error code of 3xx signify?

A POST (Power-On Self-Test) error code in the 3xx range specifically indicates a problem related to the keyboard. During the POST process, the computer conducts a series of checks to ensure that essential hardware components are functioning properly before loading the operating system. If the system encounters an issue with the keyboard—such as a connection problem, malfunctioning keys, or absence of a keyboard—it generates a 3xx error code to alert the user.

This may typically involve issues like a failed connection or a missing peripheral. Recognizing this error is crucial because it informs the user that interaction with the system via the keyboard cannot take place, affecting the ability to navigate or control the computer.

In the context of the other choices, problems with the floppy drive, hard drive, or network adapter would typically generate error codes outside of the 3xx range, as each hardware component has its own designated code ranges for POST errors.