“I guess I was shipped the rare example of a non working Rpi4. I have owned one from each generation and have never had an issue getting them to boot. Tried three SD cards, 1 brand new, 2 that work in my Rpi 3s. Fresh installs of Rasbian Buster all failed, then NOOBS on all three failed. I get the power light to light and a brief flash on the activity light then nothing. Pimoroni custermer service has been great. waiting for my replacement board after which I will update this review.”