


Recovering entire drive from a day-old known-good clone.'Repair install' using latest Combo Update.Restoring random items in ~/Library/Preferences including, at one point, the entire folder.Any amount of messing with the keychain - Repairing, Erasing.Logging out of everything iCloud related then back in again.It worked yesterday & still works for all other machines in the house. Checking Firewall settings til I was blue in the face.These things were recommended elsewhere but they did not work for me: I stared at it for 5 minutes, then rebooted. Mine at this point appeared to fail & the iMessage login screen just went grey. Hold Cmd ⌘+ Opt ⌥+ P+ R at the chimes until they are heard for a second time, then releaseĪs soon as you hear the second chimes hold Shift ⇧ & keep holding until you see the regular startup progress thermometer

Once you've done that, please see if you get the same result.Update December 2016 - this happened once more - this fixed it again, so I'm even more certain of it now. If you need to find or erase your device before you remove it from your trusted device list, you can use Find My iPhone. Removing a trusted device will ensure that it can no longer display verification codes and that access to iCloud, and other Apple services on the device, is blocked until you sign in again with two-factor authentication. Select a device to view the model, serial number, and other useful information, including whether or not the device is trusted and can be used to receive Apple ID verification codes. The device list shows the devices that you're currently signed in to with your Apple ID. You can view and manage a list of your trusted devices in the Devices section of your Apple ID account page. To remove a trusted phone number, click next to the phone number you want to remove.

Choose to verify the number with a text message or automated phone call, and click Continue. If you want to add a phone number, click Add a Trusted Phone Number and enter the phone number.
