Help! Keyboard's some keys not working in a pattern. See picture

sourabh6996 wrote:

Hello People,

So My mac books keyboard was working last night, but when I woke up & start using it, some keys won't work. Following is the image working & non-working keys. Circled are the keys which are not working; it looks like a pattern. This never happened before. I have tried SMC reset, PRam Reset, & want to try reinstalling macOS but Let me know what to do with this issue? is it a software issue? or hardware? how can i fix it?

Failing Keys associated on the horizontal or diagonally (like your example )typically indicate a hardware issue—

the resolve is replace the keyboard.

You can try an external keyboard and compare your results

Learn how to get your Mac fixed and how much it will cost. Mac Repair - Official Apple Support

Get your Mac ready for service - Apple Support Get your Mac ready for service - Apple Support

Boot to Recovery and see if the keys work. The following includes how to get to Recovery mode.

How to reinstall macOS - Apple Support

If still problem I suspect a hardware problem.

If it work in Recovery then I would erase the startup disk and reinstall macOS.

sourabh6996 wrote:

Noted Thank you for confirming but do you know what might be the cause of it ?

Keyboards are complex of layers of mylar® corresponding bumps and circuit traces and spacers lying below the mechanical keys as a unit—these traces are extremely thin and wear through use, heat & expansion/contraction—and like all electronics will fail over time. No fault of the user.

They are not consider repairable typically, it is more cost effective as replaceable.

The links above are your most direct route to a hardware repair if you decide to move forward.

As leroydouglas said, this a hardware problem with the keyboard itself. You further confirmed it by showing that an external keyboard works fine.