Chosen Solution
The Mac Mini shut down itself during sleep one hour after I add a new USB3 hub to it. I have to unplug cable before I can restart it. (I didn’t know it is called SMC reset then). It happened again within an hour, before it cannot revived after it shut off the 3rd time overnight. I can no longer power it on. Can this new hub kill the Mac? I don’t want to believe it but they just happened the same time. What can I do next?
Use a self-powered (plugs into wall outlet) USB hub between the device and the new hub. Yes is is possible for a peripheral to cause problems with computers. The first order of troubleshooting most strange computer behavior is to remove any peripheral. If this answer is acceptable please remember to return and mark it accepted.
