Problem with display on pc build - P.O.S.T. Failure

[Triorchin]

I have spent hours building my PC, when I turn it on all the fans start and everything, but the display shows no signal (using HDMI.)

This is what is in the case (and the case itself)

Gigabyte ATi Radeon HD 7950 Windforce 3X 3072MB GDDR5 PCI-Express Graphics Card

Seasonic G series 550w '80 Plus Gold' Modular Power Supply

Seagate Barracuda 2TB 7200RPM SATA 6Gb/s 64MB Cache - OEM (ST2000DM001)

Pioneer BDC-207DBK 8x BluRay ROM / DVDRW SATA-II Optical Drive - Black (OEM)

Kingston HyperX Genesis Grey 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (KHX1600C9D3X2K2/8GX)

BitFenix Spectre PRO 200mm White LED - Black

Antec Kuhler H2O 620 Liquid Cooling System

Intel 3rd Generation Core i5-3570K CPU (4 x 3.40GHz, Ivy Bridge, Socket 1155, 6Mb L3 Cache, Intel Turbo Boost Technology 2.0)

Samsung 840 Series Pro 256GB 2.5 inch SATA Solid State Drive

BitFenix Prodigy Mini-ITX - White

Gigabyte Z77N-WIFI Motherboard (SKT 1155, Mini-ITX)



Could anyone point out what I could have done wrong?

 

[Triorchin]

Tried plugging into both the GPU and the motherboard, don't get any signal from either. - Is it an issue that I am plugging into a TV instead of a monitor?

I have never built a PC before, I believe I have everything plugged in that can be plugged in to both the GPU and Motherboard the GPU is slotted into the mobo and is connected to the PSU with 2 cables the Mobo is also connected the the PSU with two cables...

Sorry if this isn't the best information.



EDIT: I have just pulled out one of the sticks of RAM and it appears to be working, what would you recommend from this point?

 

[Triorchin]

Is that advice from before or after I edited my post, took one stick of RAM out (of the two) and it seems to work... should I try swapping the RAM sticks or does it mean one is faulty?

EDIT: just put it back in and turned on the PC... and it all works, did I just have it in wrong to start? or maybe I accidently moved something that meant it started working properly?

Sorry if this is hard to follow...

 

[Triorchin]

I have it all working now... just popped the ram stick back in and it works fine now... must have had it in slightly wrong somehow, anyway thanks for your help everyone... even if the problem was just my stupidity