New Build only loads without graphics card

[BRONZ3]

Just built a new PC and I'm experiencing some difficulties when it comes to getting my PC to boot. It is very temperamental which I originally attributed to the repurposed ASUS P8Z77-V LK motherboard, but I'm quite confused.

Before I explain, this is my build:
CPU - i5 2500k
GPU - EVGA 950 SSC
PSU - CX600
MOBO - ASUS P8Z77-V LK
RAM - 8 GB 1600 Crucial Ballistix (2x4GB)
HDD - WD Blue 500 GB (doesn't post when this is connected, so it's disconnected)
SSD(boot) - Samsung 840 Pro 128gb

So this is how I can get my PC to boot right now, I need the WD Hard Drive and SATA cable to be disconnected, and the GPU can not be plugged into the PSU. I have W10 installed perfectly fine on the SSD and it runs with integrated graphics, but once I try to use the GPU the PC doesn't display any video even though the fans are running. I have deleted the Integrated Graphics driver, changed PCI slots (both x16), and disconnected the motherboard from the monitor, but I still can't get any video output. I was just wondering if anyone had experienced similar problems and had a fix for this. The GPU might be dead, I'm not sure, but the fans on it do spin. Also, if anyone knows what's wrong with the HDD and the SATA that is just a plus.

 

[faalin]

is that a brand new cx600 or is it an old one you had laying around? The CX line for corsair ins not very good and could be causing all your problems.

 

[BRONZ3]

is that a brand new cx600 or is it an old one you had laying around? The CX line for corsair ins not very good and could be causing all your problems.

The power supply is brand new and I've been using corsair for a while now with no problems. The computer itself boots up perfectly fine, and I'm 95% sure it is not a power issue. Thank you for the quick response.