Essentially can’t Restart from menu; have to select Shut Down. If I select Restart, after a 30 seconds to a minute I can click the power button and it will go off. Click it again and THEN it will boot. It’s like it has to be off for some time before it boots successfully, and even then, it's not guaranteed. So my boot up process, if off, is: Click power button and wait 10 seconds, then click it again and the MP will shut off. Then click power button again and MP will start up. Restart process is essentially the same. The only way to tell whether a boot will take is if I press the power button. A successful boot will happen when I press the power button and it doesn't shut off. So, is this hardware, or software? My guess is hardware, but what. 5,1. 12 Core. 48GB RAM. Radeon Pulse RX 580 8GB. Mojave 10.14.4. Boot drive is Samsung 960 EVO.