hp elitebook 840 g7

My laptop is HP EliteBook 840 G3. First Problem: Laptop will not run from direct power source. It will run only from battery. Then it started not charging the battery. Battery was charging only after overnight shutdown. After 10 to 12 hours of break. My solution: I changed the power adapter...

Hi, I recently got a year old HP Elitebook 840 G7. It works perfectly fine, but I've noticed that after I turn the laptop off, it produces a very faint high-pitched sound followed by constant periodic high-pitched clicks. I can only hear the sound when i put my ear in the back of the laptops...