Keyboard not working on Lenovo Laptop.

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I'm experiencing problems with a Lenovo Laptop. I cannot log into Windows because the keyboard is not functioning as normal. The 'H' button is operating as a backspace for example and because I cannot see what I'm typing in the password bar, I don't know which keys are what. Only some keys produce characters and when typing other keys the system just beeps. I had this problem yesterday and I fixed it by holding the FN button and F4 or F7, I think it was F7 but now the same combination isn't working.

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/Keyboard-not-working-on-Lenovo-Laptop/td-p/922011

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