![Custom laptop power management: external activity, power on button, graceful power off, hard power switch | blog Custom laptop power management: external activity, power on button, graceful power off, hard power switch | blog](https://user-images.githubusercontent.com/26856618/33644021-4bbc27a2-d9f7-11e7-9b63-1e15b80b4280.png)
Custom laptop power management: external activity, power on button, graceful power off, hard power switch | blog
![RPi 3b doesn't boot from sd card. Without sd card, both ethernet light up, even with sd card inserted too. ACT led wont light up. 3.3v rail works. : r/RASPBERRY_PI_PROJECTS RPi 3b doesn't boot from sd card. Without sd card, both ethernet light up, even with sd card inserted too. ACT led wont light up. 3.3v rail works. : r/RASPBERRY_PI_PROJECTS](https://preview.redd.it/fvgosflk52f81.jpg?width=1080&crop=smart&auto=webp&s=24de0b35a55dda026f4ad24844cf9a8795d3af11)
RPi 3b doesn't boot from sd card. Without sd card, both ethernet light up, even with sd card inserted too. ACT led wont light up. 3.3v rail works. : r/RASPBERRY_PI_PROJECTS
![pi 3b+ - Pi 3 Model B+ has steady red PWR LED but no green ACT LED with 2018-03-13-raspbian-stretch.img - Raspberry Pi Stack Exchange pi 3b+ - Pi 3 Model B+ has steady red PWR LED but no green ACT LED with 2018-03-13-raspbian-stretch.img - Raspberry Pi Stack Exchange](https://i.stack.imgur.com/cuukk.jpg)