I've been having similar issues, although I don't have a multimetre on hand to check the GPIO. Flashes the ACT light once, then just sits with the red light on. Mind you, mine worked initially, but the next day wouldn't function with HDMI in. Boots fine without it. https://www.raspberrypi.org/forums...

The test I mentioned earlier used the same SD card. The SD card reader I have should be full compliant with standards, I've never had issues with it before. So, yes, the SD card works in my other Raspberry Pi.

You know what, screw it. I'll just use it for something else and buy a new one. Guessing I must've managed to expose it to some static electricity, which has in turn shorted the HDMI connector to ground.

So, my R-Pi 2B+ boots just fine with the same PSU, power-supply and display. Definitely something wrong with the Pi 3. How do I go about getting it replaced?

Right, still won't boot up even with official PSU. The reader I'm using is a front-panel reader/writer attached to a desktop.

It boots without the HDMI in, although it seems to be picking up something, whether that's just what it defaults to some output mode. There's a possibility it is a power problem. As for the uSDHC card reader, I'm using the built-in one. I wasn't aware you could even use an external one during bootup

Except it booted without issue two days ago, with the same charger. It has already run without issue with HDMI plugged in, but it now refuses to boot. Certainly, it's unlikely any of mine are specced correctly, but my Raspberry Pi has booted on considerably less before it stopped doing so. The Raspb...

In addition, the display is picked up, with returning the correct information, and the EDID dump seeming sane, but no picture comes out regardless of what I do.

1. Yes, I did. Admittedly it's not best practice, but I can't see it causing anything outside of corruption of the SD card. It is also my only option for restarting if it has not actually booted 2. I'm using DD on Linux, with the following syntax sudo dd if=image_file of=/dev/sdh bs=1M 3. Running tv...

I understand this, but the confusing part is that the day before, using the exact same power supply (5V, 2.1A) it booted without issue, while plugged in. I've already looked into this line of reasoning, and have had little success.This was with every cable the exact same, same screen, entire setup t...

First, I should clarify that it was fine yesterday, and while I did not start it up connected to the same screen as it was previously, I have since, and have been unable to get it to work on either of my HDMI computer screen. Details: - If plugged-in with HDMI (regardless of power-supply), the red L...