That does sound like some kind of error code indicator. I've seen the green activity LED do that during certain errors with the µSD card, but I've never heard of that with the power LED. Hopefully one of our helpful RPF engineers will chime in and offer some insight.
It's interesting that the schematic for the 3B has the POWER OK "PWR" LED fed from an APX803-46SAG chip, and the signal goes to PWR_LOW_N. On the 3B+ schematic that chip isn't mentioned, instead we have it fed by a signal called STATUS_LED_R (the green LED is now fed by STATUS_LED_G)HawaiianPi wrote: ↑Sun Mar 18, 2018 12:42 pmThat does sound like some kind of error code indicator. I've seen the green activity LED do that during certain errors with the µSD card, but I've never heard of that with the power LED. Hopefully one of our helpful RPF engineers will chime in and offer some insight.
Curious, Which older version?
I've just come across this same issue with my new Pi 3+ - using a SanDisk Ultra 8g C10.rlm wrote: ↑Sun Mar 18, 2018 9:07 pmThanks for the suggestion to try an updated O/S. It wasn't the O/S per se, but using a new micro SD card that did the trick. There is something odd with the SD cards I was using. Could read/write them and use to boot an RPi3, just not boot an RPi3B+. Using one of the new SD cards with an older version of the O/S also worked with the RPi3B+. All the SD cards I use are Cat10 and from reputable makers (Toshiba, SanDisk, etc.). Anyhoo all fixed now!
USB leads all checked out and within power loss tolerances.
GPIO ground, 5V and 3.3V pins all checked out.
Yes, that's the more likely reason in my case, I should have made that connection myself as I already knew my software wasn't compatible. I'm an idiot. Thanks for helping me understand.mahjongg wrote: This is another thread about using software that is NOT compatible with the 3B+
Backwards compatibility (new software on older hardware) has been very carefully maintained. The latest Raspbian Buster works on ALL versions of the Raspberry Pi.