Macbook Air stuck in all caps

[SamB]

Recently my MBA started only letting me input in all caps such that I could not even sign in to my account. I connected a usb keyboard and it worked just fine so I thought I must have a hardware issue. Then I updated to the latest software (High Sierra) and the problem was fixed on my MacBook Air only to return again in a couple of days. So then I did a complete reset and the problem resolved only to return again in a couple of days. Now I don't know if it is a hardware or software issue or both! Any help would be greatly appreciated.

 

[Spawn_Dooley]

You could try looking at the onscreen keyboard viewer to see if the shift key is stuck, just to verify this although you write it's a periodical issue which is very odd.

Also I'd advise to try a PRAM reset using the external keyboard:

• Shut down your Mac.
• Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
• Turn on the computer.
• Press and hold the Command-Option-P-R keys before the gray screen appears.
• Hold the keys down until the computer restarts and you hear the startup sound for the second time.
• Release the keys.

How to reset NVRAM on your Mac

 

[SamB]

Thanks for the reply and help S_D but my MBA is working properly again. I hadn't used it in about a month. Turned it on to try your suggestions and it was working just fine. Darndest thing!