New PC Keeps Black screening While Playing games *URGENT*

you might have an issue with your video card. Run a stress test program OCCT, run all 4 tests for 5 minutes and see if the computer is stable http://www.ocbase.com/

are you able to return your video card or RMA it? You can buy a different card like AMD R9 in the same price range and 20-30% faster

idk if 450w is enough for all that. i could be wrong, but i know your AMD cpu is power hungry. idk if it could cause that. you could have a faulty gpu? do you have another gpu to test it out with? you could go buy one at best buy for testing and then return it hehe

I've never been able to return a part without first going through a handful of troubleshooting steps with the manufacturer. I've also never had a bad EVGA card, so I can't tell you what they're going to do.
Try these very simple steps, first, before contacting EVGA and you should be able to blow right through their troubleshooting:
Reseat the graphics card. Remove it from the computer and reinstall it and make sure it's firmly seated. Larger graphics cards in a cramped case or on a cramped system board can have clearance issues that keep the card from fitting tightly in the slot. Check all of these things carefully to make sure it's in the slot correctly.

Triple check your drivers. If you installed the drivers straight from the included CD, there may be an update available. Check NVidia's website for the most recently available drivers.
If you immediately installed the most recent drivers after loading Windows, try the version earlier than that or the ones that came with the video card. You may need something like CCleaner or DriverSweeper to clean up bits of the drivers every time you uninstall them.

According to a conversation here: http://www.tomshardware.com/answers/id-2104703/power-requirements-evga-750-ftw.html
300 is the absolute minimum for that GPU, 450 is recommended; but if you're overclocking or have a lot of peripheral devices - 450 may not be enough. There's no such thing as having Too Much Spare Wattage. I have a 900watt in my gaming rig and I'm not using anywhere near that; but it was the most Watts for the Bucks, was a NewEgg recommendation and was on sale! Ha ha.

Reload Windows. I know that seems like a strange last ditch effort, but I've seen freshly-installed copies of Windows bluescreen/bugcheck the nvlddmkm.sys or just crashboot when the GPU is touched and reloading Windows and installing the video drivers first - before anything else (this includes LAN drivers, chipset drivers, etc) sorts things out.

You might be able to confirm the issue within Event Viewer, but since it's crashbooting and not bugchecking the system might not have had the chance to dump the crash log before shutting down and will just log a kernel error that the system was shutdown improperly.

Hope this helps!

You have 2 PCI-E graphics card slots. One x16 and One x8. You should be in the x16 slot at the top.
Try, if it will fit, seating your graphics card in the x8 Slot further down and testing with OCBase or Furmark. This will determine if the card is bad or if the MB is bad. If the problem follows after the swap, then, it looks like you're in the market for another card. If it doesn't... You get the idea.

How long did it run before it pink-screened?

Check that the GPU is seated in the socket firmly and that the monitor cable is seated and connected properly on both ends.

Run it again.

Edit:
I'm heading to bed. But it sounds like you might be dealing with a faulty graphics card. Try a different cable and/or adapter (if you're doing VGA to DVI or something) and see if that relieves the problem. If it does, change that cable and put the card back in the x16 slot. If changing the cable doesn't help, time to whip out the credit card.

If it's not working in the x8 slot, either, then it seems like you have a paperweight on your hands..