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I have an HP Probook 440.

Sometimes I will press a key and another random key gets pressed with it. For example, just a moment ago I used the right arrow key. The 'n' character was entered into the document even though my finger was nowhere near it.

Sometimes the super key is pressed, sometimes the print-screen is pressed. I am pretty sure that about 1 in every 100 keystrokes there is a random key that sends a signal saying, "I was pressed!" when it wasn't.

So what could be causing that?

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  • I've had it for three months. It was purchased used...
    – Ben Alan
    Commented Dec 25, 2022 at 3:40
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    Also check for swollen battery pressing on keyboard, if internal.
    – DrMoishe Pippik
    Commented Dec 25, 2022 at 18:46
  • I have already opened it to install memory and a hard drive, so I can't in good conscience blame the seller. I plan to clean the contacts with IPA, check for parts pressing against other parts etc.
    – Ben Alan
    Commented Dec 26, 2022 at 22:50

2 Answers 2

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Either its a genuine hardware fault. Or something has been spilt on the keyboard. From my, experience, the most common liquids are

  • coffee
  • coke
  • juice
  • cat wee (dont't laugh, it's common)

If it's because something has been spilled, you can fix it. You need to

  • open up the keyboard,
  • spray/drench it with IPA,
  • gently scrub, especially any smudges
  • gently wipe
  • let it dry
  • close it up again.

Being a laptop, you need to be more careful.

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After opening it closing it again the problem seems to have stopped for now. My educated guess is that some of the screws on the back were too tight.

Accessing the contacts on this model is way to difficult. It would be easiest to take each key off and clean them one-by-one.

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