Check the return policy if it is new, or the warranty if it is old. Many manufacturers offer a 1-year warranty that covers sudden "no power" issues. The Bottom Line Don't toss your N520 just yet. In my experience fixing tech for a decade, 80% of "broken" wireless keyboards just need a fresh battery and a re-pairing.
Happy typing
There is nothing more frustrating than sitting down to work, placing your hands on your keyboard, typing a sentence—and seeing nothing happen.
Try the steps above in order. I am willing to bet that by Step 2, you are already typing again.
If you are reading this because your has suddenly gone silent (or was dead on arrival), take a deep breath. In 90% of cases, this is not a hardware failure. It’s usually a simple communication breakdown between the keyboard and your computer.