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Here's the problem. I can flash a new image using Noobs and with the same powersupply I can boot in graphical mode without problem. When I flash an image for work, I only see a black screen with the multicolor square flashing up on the top right corner of the hdmi display or rca display.

The device is initially configured to run with a LCD Display but as I see the square on any other display that I connect, I have the feeling that video output is actually detected (could be the gpu broadcasting on any interface).

The thing is that during the boot phase, I don't see anything either. Usually we would see the pi logo with some boot logs but with that image it's completely black.

I have the feeling like the PI is trying to output to a the LCD that isn't connected... Any idea how to disable the video port and force hdmi?

Writing "hdmi_force_hotplug=1" in boot/config.txt doesn't seems to help.

  • a small rainbow icon in the upper right indicates insufficient voltage. Changing the powersupply/cable may solve the problem. – Steve Robillard Feb 13 '17 at 17:55
  • @SteveRobillard I'm aware of that. It's not the issue here. – Loïc Faure-Lacroix Feb 13 '17 at 18:11
  • As far as I know that is the only reason for that icon. – Steve Robillard Feb 13 '17 at 18:18
  • @SteveRobillard I'm not worried about the icon, I'm worried that I only see that Icon and nothing else. – Loïc Faure-Lacroix Feb 13 '17 at 18:21
  • Have you considered that under volting the Pi is the cause of the problem? – Steve Robillard Feb 13 '17 at 18:23

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