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A Error Messages and Indicators
Desktop Board D955XBK 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 11. The BIOS also issues a beep code (one long tone
followed by two short tones) during POST if the video configuration fails (a faulty video card or no
card installed) or if an external ROM module does not properly checksum to zero.
Table 11. Beep Codes
Beep Description
3 No memory
Siren CPU overheat (on reboot)
BIOS Error Messages
When a recoverable error occurs during the POST, the BIOS displays an error message describing
the problem.
Table 12. BIOS Error Messages
Error Message Explanation
PROCESSOR_THERMAL_TRIP_ERROR CPU was previously shutdown 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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