Keyboard Failure Symptoms

Typical symptoms associated with keyboard failures include the following:

  • No characters appear onscreen when entered from the keyboard.
  • Some keys work, whereas others do not work.
  • A Keyboard Error—Keyboard Test Failure error appears.
  • A KB/Interface Error—Keyboard Test Failure error appears.
  • An error code of six short beeps is produced during bootup (BIOS dependent).
  • The wrong characters are displayed.
  • An IBM-compatible 301 error code appears.
  • An Unplugged Keyboard error appears.
  • A key is stuck.

Basic Keyboard Checks

The keys of the keyboard can wear out over time. This might result in keys that don’t make good contact (no character is produced when the key is pressed) or that remain in contact (stuck) even when pressure is removed. The stuck key produces an error message when the system detects it; however, it has no way of detecting an open key.

An unplugged keyboard, or one with a bad signal cable, also produces a keyboard error message during startup. Ironically, this condition might produce a configuration error message that says “Press F1 to continue.”

If the keyboard produces odd characters on the display, check the Windows keyboard settings in Device Manager. Device Manager is located under the System icon (found in Control Panel) in Windows 9x and Windows Me. In Windows 2000, the path is similar—Control Panel, System, Hardware tab. However, in both Windows 2000 and Windows XP, Device Manager is usually accessed through the Computer Management console. If the keyboard is not installed or is incorrect, install the correct keyboard type. Also, be certain that you have the correct language setting specified in the Keyboard Properties dialog box (found by double-clicking the Keyboard icon in Control Panel).

Keyboard Hardware Checks

If you suspect a keyboard hardware problem, simply exchange it with a known-good keyboard as it is inexpensive to get one.

If the new keyboard works correctly, remove the back cover from the faulty keyboard and check for the presence of a fuse in the +5V DC supply and check it for continuity. Neither the older five-pin DIN nor the six-pin PS/2 mini-DIN keyboards can be hot-swapped. Disconnecting or plugging in a keyboard that has this type of fuse while power is on can cause the keyboard to fail. If the fuse is present, simply replace it with a fuse of the same type and rating.

If replacing the keyboard does not correct the problem, and no configuration or software reason is apparent, the next step is to troubleshoot the keyboard receiver section of the system board. On most system boards, this ultimately involves replacing the system board.


11 Responses to “Computer Hardware Problems: Troubleshooting Keyboard Problems”

  1. […] Computer Hardware Problems: Troubleshooting Keyboard Problems […]

  2. admin_papa Says:

    Hi Folks!

    Just wanted to share my new experience.

    If your system fails to start due to an error related to missing HAL.DLL, invalid Boot.ini or any other critical system boot files you can fix this by using the XP installation CD. Just boot from your XP Setup CD and enter the Recovery Console. Then launch “attrib -H -R -S” on the C:\Boot.ini file and delete it. Launch “Bootcfg /Rebuild” and then Fixboot


  3. binod Says:

    i had purchased the new keyboard for my pc but when i connect that to the computer the line is ok i mean indicators of keyboard glows but the keyboard do not works.non of the key are working.but the next keyboard on the same pc works.because of this i exchange my keyboard but the same problem is pleas solve my problem

  4. great post very usefull to readers keep posting 🙂

  5. arun Says:

    My keyboard automaticaly types in the post screen. Windows shutsdowns automaticaly search and mediaplayer window pops up…i tried to install linux but letters and numbers comes in the install menu…updated bios still no use. Removing keyboard from the jack makes everything fine..

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  9. help me i want to change my ps/2 keyboard to usb but i don’t understand that how see color combination
    ps/2 wire is

    blue yellow red white

    usb wire is

    green blue orange white

  10. Sudhakar Bhattarai Says:

    My ke board connection green ,blue, orange, white is broken. I have to fix it in four different ports by soldering. Please help me.

  11. Shruti Pandya Says:

    Hello sir,
    I am Shruti.
    I have HP omni 105 wireless desktop computer.
    Last month I downloaded the Turbo C++ software from the internet.
    I have wireless keyboard.
    It is working in all programs like MS word, MS power point, notepad, etc .. But when I open it my key board is stopped. It can’t work.
    Please give solution as early as possible.
    Thank you.

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