iMac High Sierra Upgrade - USB Keyboard not recognized

I have also been experiencing this issue (that's 22 of us so far…). It's intermittent, with the keyboard freezing after ~ 24 hours of uptime, and not showing on the System Information > USB > USB 2.0 Bus > Keyboard Hub > Apple Keyboard.

Feels like a software/firmware glitch, as this was stable AF under Mavericks, El Capitan & Sierra. No hardware changes AT ALL.

Come on, Apple, Disk Utilities is not going to fix something like this. Are you seriously going to ignore the failure of MILLIONS of full-size Apple USB keyboards due to a major OS upgrade?

My best guess is that the testing people did not have a script involving a pre-2014 iMac and model A1243 USB extended keyboards. These keyboards are USB2, so there's likely something hinky with the USB2 controller bus getting legacy signal from the USB controller.

My USB keyboard is recognized only sometimes by my late-2012 MBP running MacOS 10.13 when it’s plugged into either of the MBP’s USB ports directly. It always works when it’s plugged into either of the MBP’s USB ports through any of

• a Belkin 4-socket USB hub
• an Amazon USB extension cable
• a laptop cooling pad whose USB power plug has a USB socket

None of that VRAM or other stuff worked for me.

Here's what fixed my problem:

I repaired disk permissions through the startup disk utility at boot. I rebooted and held down Command+R to get into the menu. Then in the disk utility, I chose the disk repair option.

My Apple USB extended keyboard with numeric keypad is working. Thank goodness.

After updating my own 27" late 13 model desktop, my USB apple keyboard no longer works either. I've tried resetting SMC, NVRAM, Disk Utility (first aid) and nothing works. The keyboard, when plugged into USB does show up when I look at System Information: USB. It just doesn't work at all. It started off by the space bar not working right after the "upgrade" to High Sierra then died altogether.

After updating my own 27" late 13 model desktop, my USB apple keyboard no longer works either. I've tried resetting SMC, NVRAM, Disk Utility (first aid) and nothing works. The keyboard, when plugged into USB does show up when I look at System Information: USB. It just doesn't work at all. It started off by the space bar not working right after the "upgrade" to High Sierra then died altogether.

I have related issues. Cmd tab doesn’t change apps on my usb extended USB keyboard. I even tried reinstalling High Sierra with no improvement (as advised by tech support). So I tried the magic keyboard that came with the iMac. This fixed it.

Seems to me that there’s a bug in the USB extended keyboard driver in High Sierra.

I spent nearly 45 minutes on the phone with Apple support yesterday about this issue. Ultimately, they say my keyboard is defective and they're now sending me a new one. I find it interesting that so many people are having similar issues as I did though this was deemed a hardware issue and nothing to do with High Sierra. Things that make you go, hmm.

Hi, I got the same problem. The bluetooth keyboard that came with the iMac stopped working and got a usb one to replace it. Today after upgrading to High Sierra the Apple usb keyboard just does not work with the iMac so I'm stacked. I tried the usb keyboard with my new MacBook Pro 15" (2017) with upgrade to High Sierra and it worked. My iMac is a 23" 2016.

so, I had to plug another usb extended keyboard into the High Sierra Imac and it worked.... I then plugged the non working one into my other imac and it started working . I then plugged the orginally non functioning keyboard (worked fine before the upgrade) back in the HIgh Sierra Imac and it started working. I'd recommend once you begin your High Sierra upgrade, UNPLUG your APPLE usb extended keyboards. I have no idea what people would do who have no access to extra keyboards just laying around. Drag my Imac to the Apple Store???

This is a known and common problem with the Apple USB keyboards. It happens after almost every major OSX upgrade and BootCamp users often face the problem when switching back and forth between Windows/Mac modes. Seems Apple just chooses to ignore it. None of that usual "reset SMC or PVRAM" *bs* helps (does it ever?) ...

What DOES work though, is to unplug your wired keyboard (leave your Mac turned on) and leave the keyboard unplugged for a couple of hours. Then re-attach and hey presto - it works again. You can tell by the green light on the Caps Lock key. If it turns green when pressed the keyboard is working again.

Interesting. So, if that's consistent for multiple instances, then some kind of persistent state about the keyboard is preserving the old/incompatible setting, and once it times out, the up to date peripheral data is added to the USB state? Just trying to imagine how this approach works… and by way of unintentionally/potentially confirming this, last time it happened with me, I just used the Bluetooth keyboard for a day, then tried the USB one again. So far, several days of uptime, no hangs in ~96 hours or so. Fingers crossed.

I having the same issue, I was tring to upgrade from Sierra to High Sierra, after system reboot, I lost Bluetooth keybard, As I dont have a usb Apple keyboard, I tried two different Windows USB keyboard, didn't success. My install process stucks at "Create Account Name", because I can not input any alphabet !!!!!!!

I cannot reset computer params as it needs keyboard assistance... I am in blackhole now.