GPU dead or not?

[smellslikecurry]

system 

i7 4790k

gigabyte z97m-d3h

16gb hyperx

gtx 970

corsair cv450

 

when i push the power button fan lights come on for a second and turn off while power button's led stays on started disassembling system and its when the gpu is added it starts acting this way working fine without it so need to know if its gone kaput or if theres any problem

p.s - have tried another power supply did the same