At the moment it is running with the single SSD and an external USB HD. Years ago My Mac II, would not start and it turned out to be a battery, which a repair place charged me $100 to replace. Those computers used a keyboard to boot.
The only battery iI see is for the CMOS. other than a clock, is it used to turn on the PSU?
I want to isolate the problem. Its running now, but i guess if i shut down it could be dead again.
Core Temp shows id 40c now, so i don't think the CPU is overheating.