PI 3B+ not booting. Act led not blinking

[nbJosh]

Well, i looked into returning the Pi, however I have passed the return and support window from the seller.

Looks like I’m out of luck with this one.

[sciss]

Hello,

I have the same (?) issue. Had an ADS1115 running, plug-and-play thing with proper resistors and all. Was getting a normal ADC read-out in the code, and then out of a sudden, Pi 3 B+ freezes, nothing. Disconnected all. Tried to reboot. Nothing. Just power LED constantly lighted, no ACT coming up.

Did the measurements, +5V is all there and good, +3V is not there (measures around +7 mV). What the heck? Any ideas? I have let the thing rest for two days, hoped it was some fuse problem, didn't help.

Thanks

[B.Goode]

Did the measurements, +5V is all there and good, +3V is not there

Please refer to https://www.raspberrypi.org/forums/view ... 28&t=58151

The fourth paragraph, presented in red text, appears to address your issue.

[bburnskm]

This is a bit silly but I had been trying to boot the pi from one of the USB ports - I didn't notice the SD port on the bottom... I thought it was dead