Have you tried the "official" one for the Pi3?
It's not particularly touchy. It just needs one that is decent, and a lot out there are a bit rubbish. Also ensure you are using good quality USB power cables.
The USB cable needs to be short and thick to reduce voltage drop.
What kind of SD card were you using, and what did you replace it with?
Some phone and tablet chargers do not have very good voltage regulation, because that is not required for battery charging. I have tested 5V/2.4A chargers that dipped well below 5V at only a 1A load.
Quite right. That should be documented clearly somewhere. The 'Boot problems' sticky post for example.
Without a power supply which is stable and fit-for-purpose, the Pi will not be able to read from the SD card, and it will fail to boot. These some known power supply issues which may cause boot problems:
Unsuitable PSU: it should be able to deliver sufficient power to meet the requirements of each model.
Unsuitable micro-USB cable: some cables too long, and use very thin copper wire which is not fit-for-purpose. You should use a short, thick, good-quality cable.
What devices don't like a better PSU?
The PSU matters a lot as well, but you are correct that the USB cable is also very important. I like the Monoprice Premium micro-USB cables, but I have found several others that are nice as well. viewtopic.php?f=63&t=165393 Note that the Volutz cables are now using slightly thinner wires in their short lengths (22 AWG in 1ft/1M), but they are still awesome cables.n67 wrote: ↑Tue Nov 21, 2017 6:35 pmFWIW, there is a lot of chatter about power supplies, but a lot less about cables.
My experience is that the PS doesn't matter that much (unless you have a lot of power-hungry USB peripherals attached, which I never do) - but the cable matters a lot.
I routinely buy a bunch of USB (A to micro) cables from Monoprice - they are cheap and very good. I never have any power problems. Until I started using Monoprice cables, I used cheap/bad cables and had problems.
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