High Sierra upgrade, now problems Mac Mini 2012

(A) My wi-if network is not recognized. At first it was, then intermittently, now not at all.

(B) The bluetooth keyboard intermittently quits, requiring a restart.

(C) A bootable external drive backup that I made of 10.12 Sierra is not recognized, which means I cannot revolve teh upgrade.

(D) iStat reports high CPU temps (102+)

Any help would be greatly appreciated.

最后更新：2017-09-29 01:21:03