My LG Gram 17 (LG GRAM 17Z90N-R 17Z90N-R.AAC8U1 i7-1065G7 CPU + 8GB Motherboard EAX68997002) does not seem to even get to the point to try to boot from media (the nvme SSD is fine, I verified it on a separate computer) or turn on the display.
I have tried basic troubleshooting steps, remove the battery, disconnect the display, remove the RAM card, connect an external HDMI display. The behavior is always the same, the laptop turns on, shows the keyboard backlight, starts the fan, then it turns off the fan/light briefly, it does this sequence multiple times, let's say 6-7 times. Eventually...