Graphics Card not working [Black Screen] [Peripherals don't light up]

[Kanacken]

Hello, I've been using a GTX 770 for a long time now. I went to a friend's house, brought my desktop, ensured it was safe during transportation, and plugged it in. It turned on, but, to my surprise, the peripherals and monitor did not light up. (Basically, computer turned into a potato) So I figured it was the gpu, and I unplugged the 770 and placed in a 750ti. The 750ti worked perfectly. Booted up normally, recognized it and everything. The computer was as good as new. I tried cleaning the 770, the PCIE slot, and removing the ram to ensure nothing was lose or anything. I also checked all motherboard cables and such to make sure nothing wiggled free in transit. Everything was good. I was surprised. After hours of head scratching, reading other people's problems with similar symptoms, I decided to go out and pick myself up another card. I got a R9 390, and placed it in. Power was all in, everything. The computer started like normal, screen showing and peripherals, and I thought "Hey, the 770 must have been the problem!" Unfortunately, after I installed the AMD drivers and removed the Nvidia ones and restarted, it went back in to potato mode. The GPU's fans were spinning, so it was getting power, but whenever I turned off the system and unplugged the gpu while it still being in the PCI-E slot, it worked off of my integrated graphics. To me this appears to be a bit of a PSU issue (specs will be at the bottom), because when I plug it in it seems to really drain power from other things.
Thank you for reading.

SPECS:
i7 3770 @ 3.4ghz
(Before) Gtx 770 (Now, trying to get work) R9 390
(RAM) G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9D-16GBXL
(Mobo) Asrock Z77 Extreme 3
1 seagate 1tb hdd
PSU*** Corsair cx750m


Any help is welcome.

 

[dznuts]

could be CMOS battery its worth checking it out they are not much $ check the voltage of the battery. the corsair CX750 has enough 12v amps for the 390. i would check voltages in bios and make sure they are stable. or if you do have a spare PSU to test with do that. no video on post does point to power/bios/bad cables.

 

[Kanacken]

Thanks, i'll try the CMOS. Also, just tried updating the BIOS to newest edition. Something interesting happened here, I plugged in the card (power and all) and the PC launched. It didn't before. However, the card's fans stopped working, and when I went to dxdiag it was still running off of integrated.