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.
There is nothing more frustrating than sitting down to work, placing your hands on your keyboard, typing a sentence—and seeing nothing happen. n520 keyboard not working
Do you have another computer? Plug the USB dongle into a laptop. If the laptop doesn't recognize the keyboard, the dongle is dead. Check the return policy if it is new,
Try the steps above in order. I am willing to bet that by Step 2, you are already typing again. In my experience fixing tech for a decade,