Re: Dodged the bullet
The power supply doesent matter, the issue is the type of cable used to connect the supply to the pi, if the cable is emarked (as is required for 5A capable cables and those for higher data rates) then the pi didnt recieve power. The technicial details can be found on my original post about the issue at https://www.scorpia.co.uk/2019/06/28/pi4-not-working-with-some-chargers-or-why-you-need-two-cc-resistors/
Biting the hand that feeds IT
