Adding the NVME causes boot loop?

[zaius]

Any idea what a symptom of drawing too much power could be? I don't know much about that side of things but looping in boot seems odd.

That the computer doesn't have enough power to run?  Maybe that's why it won't boot?

Someone reported a problem with an NVMe drive not working when the battery was low.  Make sure that your PBP battery is charged and power adapter is connected.  Disconnect any peripherals that draw power (eg. USB devices).

If you get it to boot, perhaps try reducing power consumption by dimming the screen.