Hello everyone,
I have an ASUS TUF Gaming FX505GD that's powering on, showing the ASUS logo for about 2 seconds with keyboard backlight, then immediately shuts off. After it shuts down, the power button does nothing until I unplug the laptop completely. No fans spin afterward either.

I’ve tried:
- CMOS reset
- Removing the SSD/HDD
- Reseating RAM (removing each stick individually stops boot completely)
- Cleaning up recently applied thermal paste around CPU/GPU and nearby VRM components (issue persists)

With...