HP Elitebook 8440P - Blank Screen, Caps lock and Number lock flashing

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  • dicky96
    Sun Seeker
    • Mar 2017
    • 1825
    • Spain
    #1

    HP Elitebook 8440P - Blank Screen, Caps lock and Number lock flashing

    Hi guys this laptop has a bit of a history. Someone else has tried to repair it. When it came to me it was partially dismantled and has a new screen fitted

    The owner says it worked for a while after the screen was fitted, then the screen started to go 'funny' but I didn''t really get to the bottom of what they mean. They said it works with an external monitor

    What I found is, the screen is blank, it has backlight but no image and after a little while the backlight goes off. I don't get an image on an external monitor.

    All the leds are lit up and I cant hear the HDD heads moving (unless it is very quiet). Holding in the power button it shuts down again

    I tried removing the HDD and I tried removing the DIMM - to see if I get a beep code, but I don't. I put those back again.

    I then connected an external USB keyboard to see if the Caps Lock Light works but it doesn't, but for some reason once i connected the keyboard, I no longer get the backlight on the screen and the Number Lock and Caps Lock LEDs on the laptop flash three times. The flash code continue five times then stop.

    Any idea what the code means, and why the fault changed once I attached an external keyboard. Disconnecting the external keyboard I still have the flash code now
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    • Stevedb
      Stevedb
      • Feb 2018
      • 624
      • Belgium
      #2
      Re: HP Elitebook 8440P - Blank Screen, Caps lock and Number lock flashing

      Hi you can look here for the blinkcodes.

      It says cpu is not detected 3 blinks en 5 blinks.
      https://support.hp.com/us-en/document/c01732674

      Regards

      Steve

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        • dicky96
          Sun Seeker
          • Mar 2017
          • 1825
          • Spain
          #3
          Re: HP Elitebook 8440P - Blank Screen, Caps lock and Number lock flashing

          It turns out the blink code was because the DIMM was not sitting properly. Once I reseated it a few times, I don't get the blink codes.

          What is happening now is the laptop turns on with back light but a blank screen.

          Pressing the CAPS LOCK key causes the caps lock LED to flash on and off

          One time I actually got a Windows login screen on my external VGA monitor, but I am having trouble replicating that, usually the external monitor says no signal

          Any ideas?
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            • dicky96
              Sun Seeker
              • Mar 2017
              • 1825
              • Spain
              #4
              Re: HP Elitebook 8440P - Blank Screen, Caps lock and Number lock flashing

              No, tell a lie...... I'll correct that. It does give a picture on the external VGA, it just takes a very long time to load...
              Last edited by dicky96; 01-08-2021, 10:03 AM.
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                • dicky96
                  Sun Seeker
                  • Mar 2017
                  • 1825
                  • Spain
                  #5
                  Re: HP Elitebook 8440P - Blank Screen, Caps lock and Number lock flashing

                  Oh... it turns out when the other person replaced the screen they didn't replace the video cable, so I ordered one
                  Follow me on YouTube
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