If you’ve tried all five steps and the N520 is still dead, the circuit board inside has likely failed. Given the price point of this keyboard (usually $25–$40), professional repair isn't worth it.
If basic steps fail, you may need to reset the connection or address software conflicts. 1. Re-Pairing and Resetting
allows for "re-coding" if the connection is lost due to signal interference. How to Fix Onn Wireless Keyboard Not Connecting to Computer
To isolate the problem, perform this simple swap test:
Let us know in the comments below. And if you are still stuck, describe the exact behavior (lights? beeps?) and we will try to help.
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