Lenovo Ideapad 700 15ISK keyboard issue

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Hello,
Guys, I have been using Lenovo IdeaPad 700 for over a year now.Yesterday, I updated BIOS and reset windows using one key recovery. Now, the problem is whenever I press the left side Ctrl or shift or Ctrl+a, the whole keyboard stops working. If I continue pressing, then M key will give enter and is a complete mess, but it works normal if I just close and open the laptop until I press shift or Ctrl again. Pls help....