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I got a raspberry pi 3 b+ for Christmas and yesterday whilst installing a Pi Hat's Software (Rasp.io Duino) it just flat out died after showing that there was an under-voltage, even though I was using a 5.2V 9W 1.8A Amazon Alexa Power Adaptor(I am now using an IPAD 10W 5.1V 2.1A Power Adapter) , It was using BerryBoot with Raspbian and Retropie and it now uses NOOBS but it just shows the PWR LED and no ACT light activity, I've read this means that it can't read anything off the sd card but this sd card works perfectly as I had to put NOOBS onto it. This also happened with a raspberry pi 2 that I had BTW There also is 3v Power Output coming off the GPIO so it can't be this:Raspberry Pi Forum Post

I have tried to flash the sd card with the latest image of raspbian and Etcher and it still shows the same symptoms

After a while, the chips get warmer but not enough the chips actually doing anything

It does not boot anymore and I don't see any rainbow screen at all

Sorry if I'm a bit short, I'm just stressed with this situation

Edit: Now with a new rpi 3b+ the same thing has happened, but I have some extra info, the pi's 5v power is working but there seems to be no 3v3 coming in on the gpio, once again the red light is on but no green light and the I found it happened after shorting the 5v and ground pins by accident

I have just realised that i have contradicted myself :-/

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    power supply recommended for the 3B+ is 2.5A - so you're very short :p however, 1.8A should be enough with nothing connected – Jaromanda X Jan 5 at 8:22
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    now uses NOOBS - did you flash a NOOBS image onto an SD card? if so, how? - This also happened with a raspberry pi 2 that I had BTW did you fix that? – Jaromanda X Jan 5 at 8:23
  • "this sd card works perfectly as I had to put NOOBS onto it." -> That doesn't mean the card is formatted correctly. It should have an MBR and the first partition should be vfat. – goldilocks Jan 5 at 8:39
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    Try booting only the Pi, screen, and keyboard (i.e. without a HAT or anything else connected to the expansion header). Does that work? – joan Jan 5 at 9:12
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    Sorry. I didn't really read all of it – Jaromanda X Jan 5 at 11:01
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Read it again: The Boot Problems Sticky it covers 99.999% of reasons your RPi won't boot.

Then download plain Raspbian and https://etcher.io and use Etcher to rewrite your SDCard. It's highly likely that the version of Raspbian on the card is too old for your RPi3B+ hardware.

The common symptom of Raspbian that's too old is the lightning arrow for undervoltage. It's a massive clue.

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Same thing happened to me with NOOBS, I just downloaded the Raspbian .zip from https://www.raspberrypi.org/downloads/raspbian/ and flashed it using Balena Etcher from https://etcher.io/ Its really simple to use and you don't even need to unzip the file. Hope this helps!

  • If you had read my question you would have seen that I had done this BTW thx for being polite – Bob Willett Jan 5 at 20:24
  • Tried your methodology (using .zip instead of extracting .img) but it did not work – Bob Willett Jan 5 at 20:48

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