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A Error Messages and Indicators
Desktop Board D975XBX2 reports POST errors in two ways:
• By sounding a beep code
• By displaying an error message on the monitor
BIOS Beep Codes
The BIOS beep codes are listed in Table 10. The BIOS also issues a beep code (one
long tone followed by two short tones) during POST if the video configuration fails (a
faulty graphics card or no card installed) or if an external ROM module does not
properly checksum to zero.
Table 10. Beep Codes
Beep Description
3 No memory
Siren Processor overheat (on reboot)
BIOS Error Messages
When a recoverable error occurs during the POST, the BIOS displays an error message
describing the problem.
Table 11. BIOS Error Messages
Error Message Explanation
PROCESSOR_THERMAL_TRIP_ERROR Processor was previously shut down due to a thermal
event (overheating).
MULTI_BIT_ECC_ERROR The firmware has detected that a Multi-Bit ECC Error
occurred.
SINGLE_BIT_ECC_ERROR The firmware has detected that a Single-Bit ECC Error
occurred.
CMOS_BATTERY_ERROR The firmware has detected that a CMOS battery failure
occurred.
CMOS_CHECKSUM_ERROR The firmware has detected that a CMOS Checksum Error
occurred.
CMOS_TIMER_ERROR The firmware has detected that the system date/time
has not been set.
MEMORY_SIZE_DECREASE_ERROR The firmware has detected that the system memory has
decreased.
INTRUDER_DETECTION_ERROR The system chassis was opened.
SPD_TOLER_ERROR SERIAL PRESENCE DETECT (SPD) device data missing or
inconclusive. Properly programmed SPD device data is
required for reliable operation. DDR2 533 MHz memory
assumed at slowest timings.
MEM_OPTIMAL_ERROR The installed amount of memory in Channel A is not
equal to the amount of memory in Channel B.
Maximum memory performance is achieved with equal
amounts of memory installed in each channel.
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