1. SOMETIMES when I turn on my computer it will sound a rapid series of beeps until I turn it off and restart. What's wrong?
2.Related question: Sometimes while using my computer the screen will start fluttering, and neither the mouse nor keyboard will work until I turn off & restart the computer.
This question was answered on August 22, 1999. Much of the information contained herein may have changed since posting.
Your profile indicates a HP computer When HP turn on they will indicate errors during the startup POST(power on self test), by beeping Below you will find further HP information regarding these errors:
HP Pavilion PCs - Error or Beep Codes
Introduction
Errors can occur during POST (Power On Self-Test), which is performed every time that you turn on your system Each time that the computer is turned on, the POST checks the following:
System motherboard
Memory
Keyboard
Certain peripheral devices
POST
The POST is operating while the HP Logo is being displayed There will be three potential results of POST:
POST does not detect any errors; the system beeps once and starts up Microsoft (R) Windows
Errors that do not prevent the startup process (non-fatal errors) display a message that looks similar to the following:
ERROR Message Line 1
ERROR Message Line 2
At this time, you can note the error and press ESC to resume the startup process or F1 to enter the Setup program
Errors that prevent the startup process from continuing (fatal errors) are communicated by a series of audible beeps If this type of error occurs, refer to the BIOS Error Messages and Beep Codes sections that follow
For most displayed error messages, there is only one message If a second message appears, it is "RUN SETUP" If this message occurs, press F1 to run BIOS Setup
This document explains BIOS error codes and beep codes for the HP Pavilion PC Model x4xx Series
BIOS error messages
Error Messages
Explanation
8042 Gate - A20 Error
Gate A20 on the keyboard controller (8042) is not working Replace the 8042
Address Line Short!
Error in the address-decoding circuitry on the motherboard
Cache Memory Bad, Do Not Enable Cache!
Cache memory is defective Replace it
CH-2 Timer Error
Most AT systems include two timers There is an error in timer 2
CMOS Battery State Low
CMOS RAM is powered by a battery The battery power is low Replace the battery
CMOS Checksum Failure
After CMOS RAM values are saved, a checksum value is generated for error checking The previous value is different from the current value Run BIOS Setup
CMOS System Options Not Set
The values stored in CMOS RAM are either corrupt or nonexistent Run Setup
CMOS Display Type Mismatch
The video type in CMOS RAM does not match the type detected by the BIOS Run BIOS Setup
CMOS Memory Size Mismatch
The amount of memory on the motherboard is different than the amount in CMOS RAM Run BIOS Setup
CMOS Time and Date Not Set
Run Standard CMOS Setup to set the date and time in CMOS RAM
Diskette Boot Failure
The boot disk in floppy drive A: is corrupt It cannot be used to boot the system Use another boot disk and follow the onscreen instructions
Display Switch Not Proper
Some systems require a video switch on the motherboard to be set to either color or monochrome Turn the system off, set the switch, and then power on
DMA Error
Error in the DMA controller
DMA #1 Error
Error in the first DMA channel
DMA #2 Error
Error in the second DMA channel
FDD Controller Failure
The BIOS cannot communicate with the floppy disk drive controller Check all appropriate connections after the system is powered down
HDD Controller Failure
The BIOS cannot communicate with the hard disk drive controller Check all appropriate connections after the system is powered down
INTR #1 Error
Interrupt channel 1 failed POST
INTR #2 Error
Interrupt channel 2 failed POST
Invalid Boot Diskette
The BIOS can read the disk in floppy drive A: but cannot boot the system Use another boot disk
Keyboard Is Locked...Unlock It
The keyboard lock on the system is engaged The system must be unlocked to continue
Keyboard Error
There is a timing problem with the keyboard Set the Keyboard option in Standard CMOS Setup to Not Installed to skip the keyboard POST routines
KB/Interface Error
There is an error in the keyboard connector
Off Board Parity Error
Parity error in memory installed in an expansion slot The format is:
OFF BOARD PARITY ERROR ADDR (HEX) = (XXXX)
XXXX is the hex address where the error occurred
On Board Parity Error
Parity is not supported on this product; this error will not occur
Parity Error
Parity error in system memory at an unknown address
Beep codes
Beeps
Error Message
Description
1
Refresh Failure
The memory refresh circuitry on the motherboard is faulty
2
Parity Error
Parity is not supported on this product (and will not occur)
3
Base 64 kilobytes (KB) Memory Failure
Memory failure in the first 64 KB, or Monitor not plugged in
4
Timer Not Operational
Memory failure in the first 64 KB of memory, or Timer 1 on the motherboard is not functioning
5
Processor Error
The CPU on the motherboard generated an error
6
8042 - Gate A20 Failure
The keyboard controller (8042) may be bad The BIOS cannot switch to protected mode
7
Processor Exception Interrupt Error
The CPU generated an exception interrupt
8
Display Memory Read/Write Error
The system video adapter is either missing, or its memory is faulty This is not a fatal error
9
ROM Checksum Error
ROM checksum value does not match the value encoded in BIOS
10
CMOS Shutdown Register Read/Write Error
The shutdown register for CMOS RAM failed
11
Cache Error/External Cache Bad
The external cache is faulty
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registered trademarks of Microsoft Corp
Copyright Hewlett-Packard Co 1998
This information is subject to change without notice and
is provided "as is" with no warranty
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About the author
Posted by Ken Colburn of Data Doctors on August 22, 1999
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