SD card will not initiate or boot.

Development Boards MicroMod
1

I have received 7 of the RPI3B+. They will not boot. I just get a flashing green light. Slow first, then fast and then back to slow.

I would suggest the sd card was bad, but I can take them and put them into other RPI3B+ and they work fine. I have tried multiple sd cards and in all 7 of the Sparkfun RPI’s. Is there something I need to do to initiate your RPI’s?

2

It’s super unlikely that 7/7 are defective, so I would still suspect a power problem or an SD/image issue…are you using NOOBs? https://www.sparkfun.com/products/14643, click on documents tab

Scroll down quite a bit here to see the guide for flashing LEDs on the Pi https://pimylifeup.com/raspberry-pi-red-green-lights/