Keys not working at all

Some keys that are not working at all on my keyboard. (Shift left and right, space bar, enter, alt, z, b, n).
Yes, I have reseated the ribbon cables and did not work.
I am running windows 10 Pro
I am using the on-screen keyboard to type.

sounds like it could be a bad keyboard. I would contact support.
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I have replaced the keyboard but still have the same problem.

Also, the function keys and backlight does not work either.

keep in touch with support then, if a keyboard replacement didn’t work all those issues could instead be a mainboard problem.

I had that problem. None of my keys worked and no backlight. I needed a new input cover. Work with support.