You need to enable the profile in BIOS for RAM to run at 3000MHz. Because when you put it in your system it runs at stock DDR4 Speed. Option you're searching for is called XMP
So I have a Asus X540LA laptop, and it has windows preinstalled. If I reinstall OS using USB (windows media creation tool) will key automatically activate or what?
First contact Corsair and see what's up. Maybe they will send you a new one, if problem persists then buy a new one. I myself have a Razer Deathadder Tournament Edition, its quite good.