My lenovo ideapad 100 keyboard is not working. I can't type in my password. What should I do?

See if Any keys work before windows starts. Like F2 or Del or F8.
If there was a spill, bury the laptop in rice for a day or two. Or replace the keyboard.
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Instructions
https://www.lenovoservicetraining.com/showcase?sid=701&key=TGVuZw==

Plug a keyboard into it via USB. I think there's a USB connection on that machine.

I have the same problem

I have same problem, won't accept beginning of password then only 2nd letter.

Ill never ever buy any product of lenovo again!

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I have also same problem.