Caps lock light flashes once, then no power - HP Envy x360

[nick-gable]

My Envy x360 recently stopped working after connecting a charger to it that appeared to be faulty. A previous day, my friend had connected that same charger (USB-C) to his computer, and his computer at that point powered off and would not power on again. I connected the day after to my own computer and faced a similar issue, where my computer would not show any signs of life (no power indicator when plugged in, would not turn on).

I opened up the computer and removed the SSD from it so that I could read some of my data off of it. After doing that, I also unplugged the battery connector cable and plugged it back in per some advice I found on another forum post with similar issues. After doing this, my computer now is able to power on, but only briefly. As of right now, the only "signs of life" my computer is showing are these:

• When I plug in a charging cable, the power indicator light comes on. This light started as orange, but changed to white when I left it connected overnight, leading me to believe that there is some level of communication with the battery indicating that it was charged. 
• When I press the power button, the power indicator light comes on for about 5 seconds. No display activity is seen, and none of the keys are responsive (including keys that would light up when pressed, like Caps Lock or the Camera block key). After about 3-5 seconds, the caps lock key flashes exactly once, and then the computer turns off.

It is worth noting in all of this that my drive is not connected, since I have been taking files off of it that I needed imminently after the failure. 

My main question for anyone in this community is: does anyone know with confidence what the single flash of the Caps Lock key means? I've looked at the HP guide for notebook laptops and caps lock error codes, but there is no reference to a single flash on that page. In other forum posts, I've seen a different chart that seems to indicate that a single flash refers to a CPU problem, but I'm not too sure on that because a) those posts seem to be older; b) the sourcing on those posts is questionable, linking to HP support pages that no longer exist; and c) because a CPU failure seems less likely to be the problem after something that seems very related to the power systems of the device.

Of course, if anyone else has had a similar problem or insights, please let me know 🙂 Also, I have already tried a hard reset numerous times - that seems to be the classic suggestion to these sorts of problems, but unfortunately this seems to be more severe of an issue for me.