It sounds like you're dealing with a keyboard that’s becoming less responsive, which can be frustrating. Since you've already cleaned the dust and debris, there might be a few other reasons why you're experiencing this issue with your Dell Latitude 7490. Here are some potential causes: (1) Worn-out Key Mechanism: Over time, the mechanical parts beneath the keys can wear down, causing them to become less responsive. This can happen especially if keys are frequently pressed harder than usual. (2) Dirt or Residue in the Key Mechanism: Even though you’ve cleaned the dust, there might still be some residue or oils from your fingers stuck under the keys, which can cause them to become sticky or unresponsive. (3) Keyboard Connection Issue: Sometimes, the keyboard’s internal connection to the motherboard can become loose or faulty, leading to intermittent response or requiring harder presses to register. (4) Software or Driver Issues: A driver conflict or outdated software might be causing the keyboard to behave...