Tab key not working!

"There is no other user for my computer. I also noticed a while ago. The dimmer light key doesn't work either. How do I know if it's damaged hardware or the operating system?"

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A. Create Another Administrator:

If there is no user, then create another administrator (for troubleshooting purposes). Then, delete it one no longer needed.

B. It Might the the Application:

What's the application you are using this with? You may have to uninstall it.

C. [Command + tab keys]:

Hold down Command + press Tab. Does anything popup? What I Get:

suzyQ526 wrote:

I have a MacBook pro retina early 2015 High sierra 10.13.6 and suddenly the tab key doesn't work. I need to be able to tab for an online simulation required for my job. Any suggestions or other keys that I can use instead? Thanks!

Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379

If no resolve try an external keyboard to compare your results.

Typically a single key / keys in a straight line / keys in a diagonal failure indicates a hardware issue (ie keyboard failure, or trackpad cable that feeds the keyboard) a known issue esp 2015 MBP

You can try remapping the key from >System Preferences>Keyboard

Alternatively:

Remap Keys—

Check out Karabiner

https://karabiner-elements.pqrs.org

or

Ukelele to create a custom keyboard layout—some caveat here:

Unfortunately Ukelele can only remap character keys to other characters

https://software.sil.org/ukelele/

or

https://www.keyboardmaestro.com/main/

suzyQ526 wrote:

Well I tried the first suggestions and it did nothing.

I am really afraid to mess around too much with the keyboard settings. Isn't there another key I can use to tab? I don't want to have to spend a ton of $ for one key!

Then try all the other alternate suggestions as posted above...

or Call Customer Support  (800) MY–APPLE (800–692–7753)

or on line  https://getsupport.apple.com/

or call  AppleCare Support at 1-800-APLCARE (800-275-2273)

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

https://support.apple.com/en-us/HT201232

suzyQ526 said:

"Tab key not working!: I have a MacBook pro retina early 2015 High sierra 10.13.6 and suddenly the tab key doesn't work. I need to be able to tab for an online simulation required for my job. Any suggestions or other keys that I can use instead? Thanks!"

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Single Out this User:

Try a new user, seeing if you get any difference. If so, then it is a misconfiguration in the current user. If there is no difference, then it is likely a misconfiguration with the install, in which case you have to reinstall the macOS.