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Compaq Post Errors

When your Compaq machine boots up sometimes you will get an error code, or a number of beeps. This table explains what these Post messages actually mean.

N.B. In the action section, if there is a comma (,) separating two tasks this stipulates the order they are to be carried out in.

MessageBeeps    Probable CauseAction
101 - ROM Error1 long
2 short
System ROM ChecksumReplace ROM, Replace System Board
101 - I/O ROM ErrorNoneOption ROM ChecksumReplace ROM
102 - System Board FailureNoneDMA, Timers, etc..Replace System Board
162 - System Options Error2 shortNo Disk Drive or Disk FailureRun Computer Setup
162 - System Options Not Set2 shortConfiguration IncorrectRun Computer Setup
163 - Time & Date Not Set2 shortInvalid Date or TimeRun Computer Setup
164 - Memory Size Error2 shortMemory Config IncorrectRun Computer Setup
174 - ISA Config Error1 shortPnP ISA Board Not FoundRun Diagnostics
175 - ISA Config Error1 shortPnP Config Not UpdatedRun Computer Setup
178 - Processor Config InvalidNoneProcessor ErrorRun Computer Setup
201 - Memory Address ErrorNoneRAM FailureReplace Memory, Replace Mainboard
203 - Memory Address ErrorNoneRAM FailureReplace Memory
205 - Memory ErrorNoneCache ErrorRun Computer Setup
206 - Secondary Cache ErrorNoneCache Controller or MemoryRun Computer Setup
301 - Keyboard ErrorNoneKeyboard FailureReconnect Keyboard, Replace Keyboard
303 - Keyboard Controller FailureNoneI/O Board ControllerReplace Keyboard, Mouse, System Board
304 - Keyboard or System Unit FailureNoneKeyboardReplace Keyboard, Mouse. System Board
40X - Parallel Port X Address Assignment Conflict2 shortBoth External and Internal Ports Assigned to Port XMRun Computer Setup
402 - Mono Adapter Failure1 long
2 short
Mono Display AdapterReplace Adapter
501 - Display Failure1 long
1 short
Video Display ControllerReplace Video Card
601 - Disk Controller FailureNoneDiskette ControllerRun Computer Setup, Check/Replace Cables, Replace System Board
602 - Diskette BootNoneDiskette in Drive A:Remove any Floppy Disks
605 - Diskette Drive Error2 shortMismatch Drive TypeRun Computer Setup
611 - Primary Floppy Address Conflict2 shortConfiguration FailureRun Computer Setup
612 - Secondary Floppy Address Conflict2 shortConfiguration ErrorRun Computer Setup
702 - Coprocessor Detected But Not ReportedNoneConfiguration ErrorRun Computer Setup, Replace Processor, Replace System Board
703 - CMOS Reports a Coprocessor That Has Not Been Detected by Post2 shortConfiguration ErrorRun Computer Setup, Replace Processor, Replace System Board
1151 - Com Port 1 Address Assignment Conflict2 shortBoth External and Internal Ports Assigned to Com 1Run Computer Setup
1152 - Com Port 2 Address Assignment Conflict2 shortBoth External and Internal Ports Assigned to Com 2Run Computer Setup
1153 - Com Port 3 Address Assignment Conflict2 shortBoth External and Internal Ports Assigned to Com 3Run Computer Setup
1154 - Com Port 4 Address Assignment Conflict2 shortBoth External and Internal Ports Assigned to Com 4Run Computer Setup
1720 - Intellisafe Hard Disk Detects Imminent FailureNoneHard Disk is About to FailBackup Data and Replace Hard Disk
1771 - Primary Disk Port Address Resource Conflict2 shortInternal and External HDD Controller Both Assigned to Secondary AddressRun Computer Setup
1772 - Primary Disk Port Address Resource Conflict2 shortInternal and External HDD Controller Both Assigned to Secondary AddressRun Computer Setup
1780 - Disk 0 FailureNoneHDD Drive / Format ErrorRun Computer Setup, Replace HDD
1781 - Disk 1 FailureNoneHDD Drive / Format ErrorRun Computer Setup, Replace the Drive
1782 - Disk Controller FailureNoneHard Drive Circuitry ErrorRun Computer Setup, Replace the HDD
1790 - Disk 0 FailureNoneHard Drive or Wrong Drive TypeRun Computer Setup, Run Diagnostics
1791 - Disk 1 FailureNoneHard Drive or Wrong Drive TypeRun Computer Setup, Run Diagnostics
1800 - Temperature AlertNoneInternal Temperature Exceeds SpecificationCheck all Air Vents are Clear and Cooling Fan is Running
XX000Y ZZ Parity Check 2NoneParity RAM FailureReplace Memory, Replace System Board
Hard Drive Parameter Table or BIOS Error - System HaltedNoneConfiguration or Hardware FailureRun Computer Setup
IOCHECK Active Slot XNoneDefective Board in Slot XRun Computer Setup
Bus Master Timeout Slot XNoneDefective Board in Slot XRun Computer Setup
No Message1 shortPower on SuccessfulNone
No Message2 shortPower on SuccessfulNone
Resume = F1 KeyNoneAs Indicated to ContinuePress the F1 Key