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Technical Reference Guide
Compaq Personal Computers
Changed - Septembe 1997
A-1
Appendix A
ERROR MESSAGES AND CODES
A.
Appendix A ERROR MESSAGES AND CODES
A.1
INTRODUCTION
This appendix lists the error codes and a brief description of the probable cause of the error. Note
that not all errors listed in this appendix may be applicable to a particular system depending on
the model and/or configuration.
A.2
POWER-ON MESSAGES
Table A–1.
Power-On Messages
Table A-1.
Power-On Messages
Message Beeps Probable Cause
CMOS Time and Date Not Set (None) Invalid time or date
(none) 2 short Power-On successful
Run Setup (None) Any failure
A.3
BEEP CODE MESSAGES
Table A–2.
Beep Code Messages
Table A-2.
Beep Code Messages
Beeps Error Probable Cause
1 Refresh Failure Faulty memory refresh circuitry.
3 Base 64-KB Memory Failure Memory failure in first 64-KB.
4 Timer Not Operational Same as above or timer 1 not functioning.
5 Processor Error CPU-generated error.
6 8042 Gate A20 Failure Keyboard controller faulty, BIOS cannot switch to
protected mode.
7 Processor Exception Interrupt Error CPU-generated exception interrupt.
8 Display Memory R/W Error Missing graphics/video adapter or faulty video memory
(system still boots).
9 ROM Checksum Error Checksum value does not match value in BIOS.
10 CMOS Shutdown Register R/W Error CMOS RAM shutdown register failure.
11 Cache Error Faulty cache.