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WINDOWS

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.
In the action section, if there is a comma (,) separating two tasks this stipulates the order they are to be carried out in.
Message Beeps Probable Cause Action
101 - ROM Error 1 long, 2 short System ROM Checksum Replace ROM, Replace System Board
101 - I/O ROM Error None Option ROM Checksum Replace ROM
102 - System Board Failure None DMA, Timers, etc.. Replace System Board
162 - System Options Error 2 short No Disk Drive or Disk Failure Run Computer Setup
162 - System Options Not Set 2 short Configuration Incorrect Run Computer Setup
163 - Time & Date Not Set 2 short Invalid Date or Time Run Computer Setup
164 - Memory Size Error 2 short Memory Config Incorrect Run Computer Setup
174 - ISA Config Error 1 short PnP ISA Board Not Found Run Diagnostics
175 - ISA Config Error 1 short PnP Config Not Updated Run Computer Setup
178 - Processor Config Invalid None Processor Error Run Computer Setup
201 - Memory Address Error None RAM Failure Replace Memory, Replace Mainboard
203 - Memory Address Error None RAM Failure Replace Memory
205 - Memory Error None Cache Error Run Computer Setup
206 - Secondary Cache Error None Cache Controller or Memory Run Computer Setup
301 - Keyboard Error None Keyboard Failure Reconnect Keyboard, Replace Keyboard
303 - Keyboard Controller Failure None I/O Board Controller Replace Keyboard, Mouse, System Board
304 - Keyboard or System Unit Failure None Keyboard Replace Keyboard, Mouse. System Board
40X - Parallel Port X Address Assignment Conflict 2 short Both External and Internal Ports Assigned to Port XM Run Computer Setup
402 - Mono Adapter Failure 1 long, 2 short Mono Display Adapter Replace Adapter
501 - Display Failure 1 long, 1 short Video Display Controller Replace Video Card
601 - Disk Controller Failure None Diskette Controller Run Computer Setup, Check/Replace Cables, Replace System Board
602 - Diskette Boot None Diskette in Drive A: Remove any Floppy Disks
605 - Diskette Drive Error 2 short Mismatch Drive Type Run Computer Setup
611 - Primary Floppy Address Conflict 2 short Configuration Failure Run Computer Setup
612 - Secondary Floppy Address Conflict 2 short Configuration Error Run Computer Setup
702 - Coprocessor Detected But Not Reported None Configuration Error Run Computer Setup, Replace Processor, Replace System Board
703 - CMOS Reports a Coprocessor That Has Not Been Detected by Post 2 short Configuration Error Run Computer Setup, Replace Processor, Replace System Board
1151 - Com Port 1 Address Assignment Conflict 2 short Both External and Internal Ports Assigned to Com 1 Run Computer Setup
1152 - Com Port 2 Address Assignment Conflict 2 short Both External and Internal Ports Assigned to Com 2 Run Computer Setup
1153 - Com Port 3 Address Assignment Conflict 2 short Both External and Internal Ports Assigned to Com 3 Run Computer Setup
1154 - Com Port 4 Address Assignment Conflict 2 short Both External and Internal Ports Assigned to Com 4 Run Computer Setup
1720 - Intellisafe Hard Disk Detects Imminent Failure None Hard Disk is About to Fail Backup Data and Replace Hard Disk
1771 - Primary Disk Port Address Resource Conflict 2 short Internal and External HDD Controller Both Assigned to Secondary Address Run Computer Setup
1772 - Primary Disk Port Address Resource Conflict 2 short Internal and External HDD Controller Both Assigned to Secondary Address Run Computer Setup
1780 - Disk 0 Failure None HDD Drive / Format Error Run Computer Setup, Replace HDD
1781 - Disk 1 Failure None HDD Drive / Format Error Run Computer Setup, Replace the Drive
1782 - Disk Controller Failure None Hard Drive Circuitry Error Run Computer Setup, Replace the HDD
1790 - Disk 0 Failure None Hard Drive or Wrong Drive Type Run Computer Setup, Run Diagnostics
1791 - Disk 1 Failure None Hard Drive or Wrong Drive Type Run Computer Setup, Run Diagnostics
1800 - Temperature Alert None Internal Temperature Exceeds Specification Check all Air Vents are Clear and Cooling Fan is Running
XX000Y ZZ Parity Check 2 None Parity RAM Failure Replace Memory, Replace System Board
Hard Drive Parameter Table or BIOS Error - System Halted None Configuration or Hardware Failure Run Computer Setup
IOCHECK Active Slot X None Defective Board in Slot X Run Computer Setup
Bus Master Timeout Slot X None Defective Board in Slot X Run Computer Setup
No Message 1 short Power on Successful None
No Message 2 short Power on Successful None
Resume = F1 Key None As Indicated to Continue Press the F1 Key

Back to BIOS

IBM BIOS

Indicator

 Message

One Short Beep

 Normal POST system OK

Two Short Beeps

 POST error, see screen for error code

No Beeps

 Power, Power Supply Loose Card or Short

Continuous Beep

 Power, Power Supply Loose Card or Short

Repeating Short Beep

 Power, Power Supply Loose Card or Short

One Long and One Short Beep

 System Board

One Long and Two Short Beeps

 Video (Mono/CGA Display Circuitry)

One Long and Three Short Beeps

 Video (EGA) Display Circuitry

Three Long Beeps

 Keyboard Card Error

One Beep, Blank or Incorrect Display

 Video Display Circuitry

Back to BIOS

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