Question No display to graphics card

[JakeStuckAtHome]

When I have everything ran to my GPU...there is no display to anything. I checked in the bios, and it doesn;t even show there is anything in the pcie slot. It will boot and display when ran off my onboard graphics though. I think I have tried about everything. Not sure weather it's my GPU or my motherboard at this point, any suggestions would be helpful.
i7 7700k not overclocked.
16GB DDR4 XPG ADATA
GTX 980Ti ASUS STRiX ROG

 

[rgd1101]

which motherboard? try another slot on the motherboard?
make and model of the psu?
new gpu or used?

 

[JakeStuckAtHome]

ASUS Maximus Hero IX
I’ve tried every PCIe slot to no avail.
I’ve also tried two different graphics cards and nothing.
My main card is an ASUS STRiX GTX 980Ti I’ve had for almost two years.
The other card I’ve tried is an EVGA GTX 980.
I’ve tried multiple cards, all the pcie slots and nothing.
Everything was working until I took my card out for a brief moment. Put it back in and nothing.
So I’m kind of slumped.

 

[rgd1101]

PSU?

 

[JakeStuckAtHome]

650 Watt EVGA Fully Modular