This usually lights up automatically when the computer is turned on. Only when this light is on can you count the numbers on the right side of the keyboard. If the light is off, there is no response when you enter a number. The "NumLock" key is usually more than 7 words.
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If the computer keyboard indicator doesn't light up, it's probably not caused by hardware damage. It may only light up when the corresponding key is pressed, so don't worry if the keyboard indicator doesn't light up. Just press "NumLock", "caps lock" and "ScrollLock" and the three indicators will light up.
If the three keyboard indicators are still not lit after pressing the above three keys, other reasons should be considered. First of all, it is necessary to confirm whether the computer keyboard cable and the computer motherboard interface can be connected normally, and then confirm whether the connection between the computer motherboard and the interface is disconnected, whether the connecting cable is broken, and so on.
If all the interfaces are OK, try to press the buttons corresponding to the keyboard light, such as "NumLock", "caps lock" and "ScrollLock" to see if they are effective. If it still doesn't light up, you have to change the keyboard.