2017 iMP - running fine today and then a couple of minutes after the screensaver kicked in it made a brief static crack noise from the speakers and went dark. Tried the obvious with the power and buttons but no response, visually or audibly. When hooked-up to a power monitor I can see that the machine responds to the power button but only gets to around 12 watts. The machine can be commanded to fully off again. No power at the USBs at any point or LAN activity. Anything I have missed or potential ideas to try? Yeah, I do have that sickening feeling of loss. My first Apple failure!