The sticky on Pi 4B says
I only have red light. No 4 flashes. I remember having the 4 flashes when my Pi arrived 2 days ago, then I tried an older (non Buster) image on it and, who knows, maybe that somehow corrupted the bootloader?If the green LED blinks with a repeating four blink pattern then the bootloader is running correctly, and indicating that start.elf has not been found.
Any other action implies that the bootloader is not working correctly and should be reinstalled using recovery.bin. see https://www.raspberrypi.org/documentati ... teeprom.md
I tried the instructions on the documentation page (https://www.raspberrypi.org/documentati ... teeprom.md) but no luck. I insert the recovery sd card, leave it on for any number of seconds, but no luck, I don't get the green led to flash, rapidly or otherwise. Also, no "error pattern", as in the revovery zip README file, wherever that pattern may appear (I have tried receovery with and without hdmi cable attached. No difference.)
The power adapter is the official one, 5.1V, 3A, so that's not it (though I tried with another since facing the problem, to no avail). I have tried booting with both Buster full and Buster lite, SD cards that booted just fine on a Pi 2B. Nothing. I connect LAN cable and no ethernet port lights ever light up.
My Pi 4B seems dead in the water. Should I just return it?