IBM 689912U Hardware Maintenance Manual - Page 223
Diagnostic error messages, Software generated messages
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Error Messages Messages generated by the software-the operating system or application programs-generally are text messages, but they also can be numeric. Basically, there are five types of error messages. POST error messages POST beep codes Diagnostic error messages Software generated messages Multiple messages Error Message POST Error Messages POST Beep Codes Diagnostic Error Messages Software Generated Error Messages Multiple Messages Description Displayed when POST finds problems with the hardware or detects a change in the hardware configuration. Sounds emitted from the speaker if POST finds a problem. One beep indicates POST completed successfully. Multiple beeps indicate a problem was found by the POST. Displayed when a test program finds a problem with a hardware option. Displayed if a problem or conflict is found by an application program, the operating system, or both. For an explanation of these messages, refer to the information supplied with that software package. The first error that occurs can cause additional errors. Follow the suggested action of the first error displayed. In this case, the system displays more than one error message. Always follow the suggested action instructions for the first error message displayed. Reference Information 213