MacPro 2010 Server 5.1 running OS Sierra suddenly refuses to sleep
Out of the blue after many months with no sleep problems, can no longer get my MacPro to sleep, even with Zzz app enabled/disabled. Have cleared all the caches etc etc, zapped the PRAM, reset the SMC all to no avail. Computer energy saver set to 15 minutes but it just sails on by without sleeping, and ignores the Apple menu command to sleep.
Activity monitor shows just one process preventing sleep, under CPU/Disk/Network, namely something called hidd, showing designated user for the process as _hidd. It shows parent process as launchd (1)/kernel task (0) and Process Group as hidd (111)
Does anyone have a clue what this might be? Thanks for any help
Mac Pro, macOS 10.12