Pc won't turn on

[pokistyle]

Hello, I've been using the GTX 960 for like 3 years now with an xps 8700 and now it suddenly shut down and won't turn on I've test the ps w.o the GTX 960 plugged in(6pins) works fine. It won't turn on with the gpu is plug. I put the old gpu(GTx 720) back in and it works fine. It this a gpu or ps problem considering I ran the GTX 960 for like the pass 3 years?

 

[dontlistentome]

What is the make and model of the power supply and how long have you had it?

 

[pokistyle]

What is the make and model of the power supply and how long have you had it?

It's from Dell and I bought it like 3-4years ago