My PNY GTX 780's PCI-e ports do not work. (No Signal but signal without the cables) Cheap PSU with bad cables? Or damaged GPU?

billywws

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I've recently built my first computer. Everything works, except for my GTX 780. When I don't have the PCI-e cables plugged in, it shows the message to power down and connect them. When I do, I get no signal. The on-board graphics work though. I'm not sure if it's because it's a crap PSU, or my GPU is defective. I'm a bit worried about it, and I don't want to realize I've wasted over £400 on a broken GPU.

My PSU is from EVO Labs, and it's a 750W PSU. I looked at it on Amazon/eBay. And by average it's around £20/£35. I think it might be the PSU, but I'm still really worried. If anybody could help, that would be amazing. It also only had one 6+2 PCI-e cable, and I used a Molex to 6-pin cable for connecting the 6-pin to the GTX 780. It doesn't work. I've been thinking of investing in a CORSAIR CX600 PSU, since I've heard good things about it. So I REALLY hope it's the PSU, because if it is the GPU, I don't know what to do about it, so I've pretty much wasted over £400 and can't afford to get another if it is the GPU. :(

Although, I have a suspicion that it's a higher chance that the PSU is terrible. Because without the PCI-e cables, I do get signal but I get the error message to connect the cables, so it MIGHT NOT be the GPU.

If anyone could advise me, I will appreciate it LOADS.

UPDATE: I got myself a CORSAIR CX600 PSU. I plugged everything in, but still... no signal. The on-board graphics still work and everything else. In the BIOS, I set it to only use a video card if available, but the PCI-e ports don't work. I tried both HDMI and DVI, but neither of them work. I plug the PCI-e cables out, I get the error.

Just in case anyone wants to know the specs:

Case: ZALMAN Z9 ATX Case

Motherboard: Gigabyte H81M-H Ultra Durable Motherboard

CPU: Intel Core i5-4460 3.2GHz CPU

GPU: PNY NVIDIA GeForce GTX 780 HDMI/DVI

HDD: 3TB HDD

RAM: x1 8GB DDR3 RAM Stick

OS: Windows 7 Ultimate 64-Bit

Total: Around £750

Please help me on this. I don't want to have wasted £400 on a defective GPU if that's the case. :'(
 

billywws

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My motherboard does not have any BIOS updates released for it. It's relatively new, made in 2014. I checked Gigabyte's website for my motherboard, but there's no new BIOS version. Even if there was, I'm very scared of re-flashing my BIOS due to me doing it once to another mobo and it ended up bricking the whole thing.
 

billywws

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I tried it in another machine, and it did the same thing, no signal. So it must be a defective GPU that I'll need to RMA.
 

billywws

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I'm planning to go back to the store for a replacement card, repair or refund. Thanks for the help anyway.
 

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