Solved! Lenovo keys not working

Mar 6, 2019
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I have a 18mth old Lenovo YOGA 520. All of a sudden 3 keys (s, c, p) aren’t working. They work in the onscreen keyboard. I’ve tried turning it in and off, cleaning under the keys (they were very clean anyway), making sure sticky keys was off and all language setting are normal. Any ideas?? Thanks
 
Solution
Check with an external USB keyboard
boot with ubuntu live from an USB flash drive to verify, that it´s not a windows problem

Finally: Get in touch with Lenovo, should be still under warranty (2 years)