I have been running Octopi flawlessly on an SSD using a SATA to USB cable. However, I've just moved from the Pi camera to a Logitech C270 and the Pi won't boot with the SSD and camera attached. If I plug the camera in after the boot has started (activity on SSD), it boots fine and I get a webcam stream no problem. This suggests that the Pi is not sure which device to boot from when I have them both connected. Perhaps it is trying to boot from the webcam?
Does anyone know how I can specify a USB boot device or somehow delay the webcam being detected long enough for the SSD to boot?
EDIT: by the way, it's unlikely to be a power issue. My Pi is powered by a PSU that is rated for 6A.