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Compaq 500B/505B Microtower PC - Diagnostics

Interpreting Diagnostic Beep Codes
The Power-On Self-Test (POST) is a series of diagnostic tests that runs automatically when the computer is powered on. If the POST detects an error, this causes an audible beep code to sound. The POST beep codes are not necessarily accompanied by an associated, visble error code or text message.
The following table shows the POST beep codes, their meanings, and the recommended actions for solving the problem.
  warning:
When the computer is plugged into an AC power source, voltage is always applied to the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching.
Diagnostic Beep Codes
Beeps
Diagnosis
Recommended action
1 short beep, 1 long beep, 3 second pause
Bad memory or memory configuration error.
Check that the memory modules have been installed correctly and that proper modules are used.
2 short beeps, 1 long beep, 3 second pause
No graphics card installed or graphics card initialization failed.
For systems with a graphics card:
  1. Reseat the graphics card. Power on the system.
  2. Replace the graphics card.
  3. Replace the system board.
For systems with integrated graphics, replace the system board.
3 short beeps, 1 long beep, 3 second pause
CPU configuration error or invalid CPU detected before graphics card initialized.
  1. Upgrade the BIOS to proper version.
  2. Change the processor.
1 short beep, 1 second pause
No legacy floppy drive or optical drive found
  1. Check cable connections.
  2. Run the Setup utility and ensure the device port is enabled.
2 short beeps, 3 second pause
No floppy diskette or CD found
  1. Check the type of drive you are using and use the correct media type.
  2. Replace the diskette or CD with a new one.
3 short beeps, 3 second pause
Flashing not ready (missing utility or BIOS image file, etc.)
Upgrade the BIOS to proper version.
4 short beeps, 3 second pause
Flashing operation has failed (checksum error, corrupted image, etc.)
  1. Verify the correct ROM.
  2. Flash the ROM if needed.
  3. If an expansion board was recently added, remove it to see if the problem remains.
  4. Clear CMOS.
  5. If the message disappears, there may be a problem with the expansion card.
  6. Replace the system board.
5 short beeps, 3 second pause
BIOS recovery was successful
No action required.
LED Codes
The following table describes the LED states for the Compaq 500B and 505B MT Desktop PCs.
LED
State
LED Status
Power LED Indicator
System on (normal operation)
Steady green
Suspend to RAM
Blinks green every 2 seconds
Computer off
LED not on
Drive LED Indicator
Normal hard drive activity
Green drive LED is flashing
Accessing HP Insight Diagnostics
The HP Insight Diagnostics utility can be used to view information about the hardware configuration of the computer. It can also perform hardware diagnostic testing on the computer and its subsystems, which provides information for troubleshooting.
HP Insight Diagnostics runs from the recovery discs. To access HP Insight Diagnostics, the user must first create a set of recovery disks from the recovery image on their hard drive. Then they can access HP Insight Diagnostics by booting from the recovery disc that contains the utility.
To create a set of recovery discs, users need to perform the following steps.
  1. Click Start > HP Backup and Recovery > HP Backup and Recovery Manager.
  2. Click Next to open the Backup and Recovery Wizard.
  3. Select Create to create a set of recovery discs, and the click Next.
  4. Follow the wizard instructions to create a Recovery Disc Set.
  5. Use Windows Explorer to search the Recovery Disc Set for the CD in the /Hpdiags directory.
  6. Insert the CD into the optical drive on the computer.
  7. Restart the computer and the system will boot to the CD.
  8. Click the appropriate language and click Next.
  9. Click Agree in the End User License Agreement page. The utility launches with the Survey tab displayed.
Testing Memory Modules
A faulty memory module or socket can lead to memory errors, operating system crashes, or frequent system lock-ups. Memory problems can be caused by overheating, problems with the power supply, or corrosion between the memory module and socket that weakens the electrical connection.
HP System Diagnostics allows the user to run tests on the system’s hard drive, memory, and CPU. The diagnostic tool can check DIMMs to find out whether they are improperly configured, incorrectly installed, or defective.
To access HP Diagnostic Tools, the user presses the F9 button when booting the PC.
If HP Diagnostic Tools or POST beep codes indicate a memory error, check the following common memory issues before assuming that the DIMM is faulty.
Reason
Result
Remedy
Improperly configured
The user did not follow the proper configuration rules and might have the wrong part for the system.
Check the part number and make sure that the DIMMs are compatible with the system.
Improperly installed
The DIMM is not seated properly or a DIMM socket is bad or unusable.
Open the computer casing and reseat the DIMM. If this does not work, try different sockets.
Check that no debris or corrosion is in the socket.
Defective
If the above remedies do not solve the DIMM issue, the DIMM could be defective.
Replace the DIMM.
POST Error/Warning Messages
Once the display becomes available, the BIOS should classify all errors detected during POST into 3 categories and handle them as specified below:
  • Critical errors requiring system shutdown (e.g. CPU fan fault):
    Clear the screen, display the corresponding error message, pause for a while as specified and then turn the system off.
  • Serious errors requiring user's attention and response (e.g. SMART error during POST):
    Display the corresponding error message, wait for the user's input and then proceed as selected.
  • Alerts/warnings requiring user's attention (e.g. CMOS checksum error -> defaults loading):
    Display the corresponding message and pause for a while as specified. If the message includes an option for a keystroke from the user and the user responds with the key input, proceed as selected. Otherwise, continue the POST process.
When there are multiple errors happened during POST, apply the following guideline:
  • If multiple errors include at least one critical error, the system will shut down immediately after handling the first critical error.
  • If multiple errors do not include a critical error, handle all serious errors first, one by one, and then proceed to alerts/warnings. For example, if the BIOS detected a SMART error (serious error), a floppy diskette failure (serious error) and a CMOS checksum error (alert/warning) during POST, the BIOS will handle them as follows:
    For SKUs including an OS=MSV or an OS=LX in the SMBIOS Type 11 data,
    1. Handle the first serious error, SMART error, as follows:
      Display "xxx: Hard disk failure is imminent ... Press F10 for Setup, F2 to Continue”. If the user selects F10, proceed to Setup. However, if the user selects F2, the BIOS should proceed to step 2 below.
    2. Handle the second serious error, floppy diskette failure, as follows:
      Display "Floppy diskette failure ... Press F10 for Setup, F2 to Continue”. If the user selects F10, proceed to Setup. However, if the user selects F2, the BIOS should proceed to step 3 below.
    3. Handle the alert/warning message, CMOS checksum error, as follows:
      Display "Default BIOS settings have been loaded... Press F10 for Setup, F2 to Continue”. If the user selects F10, proceed to Setup. However, if the user selects F2, the BIOS should proceed to step 2 below.
      For all other SKUs,
      Use F1 instead of F10 in the above handling.
  note:
If a device fails to respond while the BIOS tries to configure the device during POST, the BIOS must not make the system look as if it locked up by having an infinite loop or waiting for too long. Instead, the BIOS must time out after a reasonable amount of time (the time varies with the device) and skip to the next process.
  note:
Unless specified in this document as above, the BIOS should not stop the POST process with any POST diagnostic screen and/or error message to draw user’s attention. For example, HP does not consider replacing a hard drive or CPU as an error condition.
Power Button/Power Button LED
The power button is under the BIOS control during POST, in BIOS Setup and after booting to a non-ACPI OS. The BIOS must respond immediately when the power button is pressed in these environments. For the ACPI-compliant OS such as Windows, the BIOS must pass the power button information to the OS via the ACPI table as specified in the ACPI spec.
If a platform offers a dual-color-based power button LED, the BIOS will program the power button LED to alternate the color between the On (ACPI S0) state and the Stand-by (S3) state. In doing so, the LED should not blink, but stay constant. Check with the corresponding platform manager for the default colors in the On and Stand-by states. The color of the power button LED in the Hibernate state (ACPI S4) is the same as in the S5 state.
To find out if the system's power button LED is dual-color capable, check the SMBIOS Type 11 data structure. If the SMBIOS Type 11 data structure contains the string DLED (NOT case-sensitive), the system supports the dual-color power button LED and therefore, the BIOS support as described above is required.
Using the Setup Utility
The BIOS Setup Utility is accessed by pressing the F10 button during startup. The BIOS Setup Utility allows you to:
  • Change factory default settings
  • Set the system date and time
  • Set, view, change, or verify the system configuration—including settings for graphics, audio, storage, communications, and input devices
  • View processor and memory settings
  • Modify the boot order of bootable devices—such as hard drives, diskette drives, optical drives, or USB media
  • Run tests on the hard drive
  • Establish a supervisor password that controls access to the Setup Utility
BIOS Updates
HP periodically releases system BIOS updates, which are available from the HP website. These updates often contain fixes for known issues in the BIOS.
To find out whether a PC needs a BIOS update, compare the current BIOS version number against the latest version available for download. To determine the current BIOS version, you should perform the following steps:
  1. Click Start > Shut Down.
  2. Select Restart, and then click OK.
  3. When the first screen displays, press F10 to enter Setup. The BIOS revision number is listed on the main menu.
  4. Write down the current BIOS version.
  5. Exit Setup by pressing Esc, selecting Yes, and pressing Enter.
Clearing CMOS
The CLEAR CMOSjumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can clear the CMOS memory of date, time, and system setup parameters by erasing the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in CMOS, which include system setup information such as system passwords.
To erase the RTC RAM:
  warning:
Except when using this function, do not remove the jumper cap from the default position or else there may be a system boot failure.
  1. Turn off the computer and disconnect the power cord.
  2. Remove the RTC battery.
  3. Disconnect the keyboard, monitor, and any other external devices that are connected to the computer.
  4. Remove the access panel.
  5. Locate the CMOS jumper header on the motherboard, as follows:
    • On model 500B it is labeled E18.
    • On model 505B it labeled CLEAR CMOS.
  6. Remove the jumper from pins 2-3 pins and put it on pins 1-2 to clear CMOS. Keep the cap on pins 1-2 for 5 to 10 seconds.
  7. Replace the jumper on pins 2-3.
  8. Reinstall the battery.
  9. Replace the access panel, external equipment, and reconnect the power cord.
  10. Turn on the computer.
  11. Hold down the F1 key during boot and enter BIOS setup to re-enter data.

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