PC won't boot when Graphics Card is installed

[Handroid]

I don't know what happened yesterday, but when I tried to power up my PC it doesn't boot up. I removed my graphics card and powered my PC after waiting a few seconds it started to boot up. I don't know whats the problem. I have this PC for like 3 years from now and I haven't change or upgraded any components except the RAM which I upgraded 2 years ago. What is the problem? The motherboard or the graphics card??

 

[Entomber]

possibly your PSU has deteriorated in performance so much that it can no longer supply enough power for your whole system when your GPU is plugged in. What is your model of PSU?

 

[Handroid]

possibly your PSU has deteriorated in performance so much that it can no longer supply enough power for your whole system when your GPU is plugged in. What is your model of PSU?

It's Gigabyte PoweRock 400W

 

[Entomber]

what's the GPU that you're trying to install? I think from that model of PSU it's very likely that your PSU needs to be replaced.