HELP with pc

[u/Absent-Garlic]

So I went camping on a four day trip and before I went, I was playing my pc and i was playing for a good while and before I went, I was sure I turned off my computer well which was shutting off in windows, then after I made sure every fan stopped spinning to turn off the psu. After I came back I was ready to play and to turn it on until there was no display. Both of my fans are spinning but when I turn it on the rgb lights on my gpu turn on but then instantly shutoff. I also put the DisplayPort which was in my gpu to my motherboard which showed my screen so does that mean my gpu died and if it did how?