sachinwalke Said:
"Shift key of Macbook air is not working: Both Shift key of Macbook air is not working, as I have continued working on financial calculations. Authorized centers checked and suggesting me to replace the pad as it has no other options, please suggest and reply as It's urgent and important for my business."
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Reset the SMC and your NVRAM: Sometimes when changes are made to the system(updates), system configurations (i.e. for keyboard) become manipulated, technically. So, reset the SMC and NVRAM. It might take upto 3 attempts to reset each. So, be certain you have the time to so do.