XFX R9 280x ceased working after unexpected shutdown

bryan56

Distinguished
Aug 1, 2015
18
0
18,520
I built my first PC about 7 months ago, and everything was in perfect working order last Friday. When I was browsing Facebook, my computer randomly shut down, and would not power back on. At the time of shut down, the computer was not under heavy load (only a few Chrome tabs were open). My parts can be found here:

http://pcpartpicker.com/p/6srFNG

When I hit the power button, nothing at all happened. However, when I unplugged the power cable from my PSU and plugged it back in, my fans would spin for less than a second when I hit the power button, but there were no other changes. I went through parts last Saturday to try to identify the problem, but with no luck. So far, I've tried:
1. Testing the PSU with the jumper included in the box. The fan on the PSU powers up and stays on, leading me to believe it isn't the PSU that's the problem.
2. I removed the cables from my motherboard that connect to the case's power button, and tried starting the computer by crossing the two prongs with a screwdriver. The fans powered up and then right back down, just like when I hit the power button.

Just today, I borrowed a friend's PSU, and my PC booted up just fine! However, there was no display. I tried removing my GPU and using the onboard Intel graphics, and my computer works just fine. What's crazy is that I switched back to my own PSU, and the PC STILL BOOTED UP FINE. I guess re-doing all the cabling had the desired effect. However, the GPU is still a problem, and I need to use the Intel integrated graphics. I haven't had a chance to borrow my friend's GPU, but I've tested my GPU in both PCIe slots on my motherboard to no effect. Interestingly, the fans on the GPU run just fine, and when I have the GPU plugged into the PCIe slot and PSU cables connected to it, I can't use the onboard graphics (probably because my PC recognizes that there's a card). My questions are:
1. Is it worth borrowing my friend's GPU to test if it's the GPU or motherboard that is the issue, or should I just RMA the GPU?
2. Is it possible that my PSU fried my GPU? It is currently providing stable power to the rest of my system.
If you have any other advice, please share it! I'm at a loss for what to do, and I'm worried if I RMA my card, it might just blow up again if my PSU is unstable.

EDIT:

My parts list is below


Component Selection Price
CPU

Intel Core i5-4690K 3.5GHz Quad-Core Processor
$224.99 Buy
CPU Cooler

Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
$25.75 Buy
Motherboard

MSI Z97 PC MATE ATX LGA1150 Motherboard
$87.88 Buy
Memory

Crucial Ballistix Sport 16GB (2 x 8GB) DDR3-1600 Memory
$61.99 Buy
Storage

Samsung 850 EVO-Series 250GB 2.5" Solid State Drive
$86.99 Buy

Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive
$49.89 Buy
Video Card

XFX Radeon R9 280X 3GB Double Dissipation Video Card
Case

Phanteks Enthoo Pro ATX Full Tower Case
$89.99 Buy
Power Supply

EVGA SuperNOVA NEX 650W 80+ Gold Certified Fully-Modular ATX Power Supply
$59.99 Buy
Optical Drive

Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
$19.89 Buy
Operating System

Microsoft Windows 10 Pro OEM (64-bit)
$124.86 Buy
Monitor

Acer H226HQLbid 60Hz 21.5" Monitor
$141.87 Buy
Keyboard

Logitech K120 Wired Standard Keyboard
$11.99 Buy
Headphones
Philips SHP9500 Headphones
$99.99 Buy
Speakers

Logitech Z313 25W 2.1ch Speakers
$34.99 Buy
Total: $1121.06