New Raspberry Pi 4B, no video output, solid red/green lights

Development Boards Raspberry Pi
1

Running out of ideas. I’ve bough 2 RPi 4B boards in a row that I can’t boot – solid red and solid green lights, no video output, not present on my LAN.

I bought one board through Amazon, another board through Sparkfun. What am I doing wrong?

I see the RPi thread on boot topics and nothing seems to work. I’ve tried

  1. Booting to two different SD cards (one imaged to Homebridge, another to Raspbian)
  2. Booting to the bootloader on an SD card
  3. Booting to a USB drive with Raspbian
  4. I’ve tried swapping power supplies
  5. I’ve tried creating the Raspbian images from multiple different computers (MacOS laptop, Windows 11 desktop)
  6. I’ve tried different SD card adapters