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During the Power-On Self-Test (POST) process, the BIOS performs a series of diagnostic tests to verify that the computer's hardware is functioning correctly. If the BIOS detects an error during the POST process, it can notify the user of the problem by displaying an error message on the screen or by producing a series of beep codes.

Error messages are displayed on the screen, providing information about the specific error that has been detected. The message may include information about the component that is causing the problem, such as the hard drive or memory, and may provide instructions on how to resolve the issue.

Beep codes, on the other hand, are audible signals produced by the BIOS that indicate the type of error that has been detected. The beeps can vary in frequency, duration, and pattern depending on the specific BIOS manufacturer and computer model. For example, a single beep may indicate a successful POST, while multiple beeps may indicate an error. The number and pattern of the beeps can provide information about the specific error that has been detected.

It's important to consult the computer's manual or the BIOS manufacturer's documentation to determine the exact meaning of beep codes for a specific computer model. Knowing the meaning of the beep codes can help diagnose the underlying hardware issue, allowing for prompt resolution of the problem.

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