Question No Display after GPU Installation

Dec 7, 2020
Graphics Card: Zotac GeForce GTX 980
Motherboard: Asus A88XM-E Motherboard
PSU: EVGA 500w W2 80+

This is the second time I've ever taken apart a computer, so sorry if I don't understand much.

I bought a new graphics card but I then realised I had to get a new PSU
So I took out my old PSU and installed the new one and then installed the graphics card. I turned it on and I'm not getting any signal to my monitor. I then took out the graphics card and booted it back up and i'm still not getting any signal to my monitor. Either with the graphics card or without. I used both the HDMI from the graphics card and the HDMI in the motherboard and also I used the VGA port on my motherboard. Still no signal, then I used a different monitor and I'm still getting the same thing
The graphics card and computer still boots up and showing lights and fans but I can't seem to get a picture on the monitor
Anyone got any suggestions?

The computer was working fine before with the PSU. Just started like this when I installed the new one

EDIT: I got it working without the graphics card but still the problem of when booting with the graphics card it still has no signal
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