I've just gotten a new iMac 27" 5k (Late 2015). Works great, apart from one minor, yet annoying issue. Whenever I reboot, it seems bot my mouse and keyboard are not working once presented with the login screen.
I can sort of solve this doing the following:
-
When at the login screen, I plugin the usb cable in my keyboard and
it (and only it – not the mouse) gets responsive. From there, I can
either login and reboot or reboot directly. -
Once the machine has rebooted and the "boot up sound" has played, I remove the cable.
-
When at the login screen, both the mouse and keyboard are now working again.
Has anyone ever encountered this issue before? It's
really cumbersome to repeat this procedure every time I do a reboot.
My system overview:
- OS X El Capitan v. 10.11.4
- Processor: 4GHz Intel Core i7
- Memory: 8 GB 1867 MHz DDR3
- AMD Radeon R9 M390 2048 MB
Best Answer
Reseting the NVRAM seems to solve the issue.
Here is the procedure.
https://support.apple.com/en-us/HT204063