Pinephone not booting, always vibrating

[Zebulon Walton]

My pinephone (postmarketOS edition) was on, and working normally when it immediately turned off. It can be that the battery is flat.

When plugging in the power, the red light turns on, and the phone immediately starts vibrating without stopping. Screen remains black.

Same behavior without battery.

What can I try to resolve the issue?

Try recharging the battery, either using an external charger if you have one or just plug the phone in with the battery installed, leaving the phone turned off. If the battery won't charge up try a different battery. (I had one go bad on me, it does happen.)