My GTX is not being recognized in my bios or devise manager.
Motherboard: Asus Maximus VI Gene
CPU: Intel Haswell I7-4770k
GPU: GTX 780
PSU: BFG 1000w
RAM: G. Skill Ripjaw 8GB4x 1333
 
i had a EVGA Supernova 750w PSU but it stopped working and switched it to the BFG 1000w and suddenly the Graphics Card didnt work.
I tried reseating it many times and everything is firmly in place. i tried different PCI-e power cords and nothing. the fans spin on the card.

i just competed both annnd nothing

dont have another pc
my current pc runs sli fine
is it a possibility my psu isnt giving it enough power?
 

How you mean 750G2 stop to work? He work or not work?
Are you sure PSU didn't pull card in grave?
 

You should RMA 750 G2 than and to check graphic card.
You must be sure before RMA card that she not work. 
Best for that is in another PC.
My PSU die on same way before one year and thanks good every part work after that like nothing happen.
Thanks god. Now thanks to EVGA I have best world Platinum PSU, 1200 P2. 

Box is not problem, but you should keep fan far from kids, if your blades are broken that's physical damage caused by improper handling.
If you have luck you can find same fan on E-Bay or Ali Express and replace and than send to technical support, but must be identical, same model and fan manufacturer, etc, everything as original.
 

PCB?

Have you tried booting with only the onboard GPU, with no cards in the system?
 

Tralapanzzy
i live in Hawaii and there is hardly any computer stores.
im starting to  think the supernova 750w killed it but not sure because the fans on the 780 work
when i had my supernova in the rig everything worked well until everything shut off suddenly.
took the psu out and gave it the paperclip test and fan wouldn't spin.
put BFG 1000w (which came out when GTX 260 were top) and the BIOS and OS didnt recognize the cards at all.

 
Just so you are aware, the 750 G2 uses Eco Mode, so unless you have Eco Mode disabled, the PSU fan will not spin until it hits a certain temperature range, even when jumped.  Did you have the PSU connected to something like a case fan to make sure something would turn on when jumped?  
 

Tralapanzzy
looks like i cant RMA my card because one fine on each fan broke and my kids tore tthe box a litttle

The box isn't an issue.  EVGA doesn't require the original box for an RMA, so a little tearing won't make a difference.  If the fan blades broke during normal usage, that shouldn't be a problem.  If you or your kids broke the fan blades, then you'll probably want to talk with EVGA tech support.