Question GPU shows no display output on Display Port

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I replaced my old power supply with Corsair CV 450 watts 80 plus bronze. I plugged in my graphics card and I already made sure that the graphics card is seated properly, the cable are not loose whatsoever. The fans is spinning, there is a light on the GPU (MSI AMD R7 370 4GB). It's not because of the power supply btw.

So the problem is that I get 0 display output. I am assuming that the gpu is dead, but at the same time I need to make sure that if it is really dead or not. So I am planning to buy a DVI cable (currently using DP) to check if it's port problem or the gpu itself. Do you guys think it is GPU's fault or just the DP port? Cause I already made sure that the DP cable is working so yeah, let me know.

PC Specs:
MSI AMD R7 370 4GB
INTEL XEON E3 1226 V3
8GB DDR3 1600mhz (Dual Channel)
500GB HDD
CORSAIR CV 450 WATT

 

[rgd1101]

what was the old psu?

 

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what was the old psu?

Cheap trash PSU I bought, AVF 550W. It made the gpu crashes, blue screen and stuff. And now it's broken, loud weird noises and the pc can't even turn on.