Cannot boot up after hours off

[tsago]

The symptoms are not conclusively indicating an issue with hardware. I'd try to see if this is reproducible with a different OS distribution booting from alternative media. 

I have experience with alternative machinery and different OS's that presented similar problems - such as Macbooks running Debian, and NetBSD on SGI hardware.  
If the native OS behaved, I could rule out the machine itself.

If you are able to reproduce this with the PinebookPro Debian on SD, then you can zero in on this being a defective unit. 

— Jeremiah

That's a fair point. Here's what I did today:

1, Booted into SD-card-located debian build
1, Downloaded the official debian build
2, Unpacked it (unxz) and wrote it onto eMMC (dd if=<debian-image> of=/dev/mmcblk1 bs=4M status=progress), overriding the existing fresh Manjaro install


4, Booted with eMMC (no SD card inserted) into the debian build. 
5, ran the upgrade script by mrfixit
6, Rebooted after the script finished and outputted that I should reboot

==> first issue: laptop powered down, but did not boot back up (but maybe this is a post-update symptom?)

7, long-press power button (5~10 sec) > short-press (3 sec) > booted up (long press only because the power led did not turn on in 3 sec as expected)
8, new restart test

==> failed the same way again

9, long-press power button (5~10 sec) > short-press (3 sec) > booted up
10, another restart test

==> failed again

11, long-press power button (5~10 sec) > short-press (3 sec) > booted up
12, Two shutdown -> boot tests; both OK

13, In shutdown state, waited 1 hour
14, Press button to boot up

==> failed

14, long-press power button > short-press > booted up

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What do you think? Is this a sufficient test to start doubting the hardware?
Do we have any specific support contacts that I can reach out to? (anybody aware?)