New build wont boot!!!

[OSI]

Hi guys, I’ve just built a brand new system for work and gaming, and this is it:

- Coolermaster ATCS 840 Full Tower Chassis
- Intel Core i7-3930K 6-Core Processor 3.2GHz
- Asus Rampage IV Extreme/BF3 X79 S2011 Intel X79 DDR3 ATX
- Corsair X79 Memory Dominator GT 16GB DDR3 2133 MHz CAS 9 XMP DHX Quad Channel
- Asus Radeon HD 7970 AMD/ATI Graphics Card - 3GB
- Corsair CMPSU-1200AXUK Professional Series Gold 1200W Power Supply
- OCZ VTX3-25SAT3-120G Vertex 120GB SATA 2.5 inch SSD
- WD 750GB 3.5" SATA-III 6Gb/s Caviar Black Hard Drive - 7200RPM 64MB Cache
- Samsung 12x BD-ROM/DVDRW Lightscribe SATA
- Corsair Memory Cooling Hydro Series H80 High-Performance CPU Cooler

I got everything together and powered up but nothing appears on my monitor (doesn’t even POST). Some of the motherboards debug LED’s appear (I think the “CPU” and “IOH_PCIE” LED’s) but I don’t know what to do from here. I’m also getting no beeps from the motherboard speaker.

I have tested the GPU and RAM on another system and they’re both working.

Any help is much appreciated…

 

[OSI]

Hi stulid,

Yeah, I've got both power connectors to the 7970 (and tested the card in another machine) and Ive plugged in power to the EATXPWR (24-pin), EATX12V_1 (4-pin) and EATX12V_2 (8-pin).

Also the number LED's light up showing "00" and don't change and the LED's directly to the left of the PCI-e lane switches don't light up even though they are switched on.

 

[OSI]

Hey guys,

After trying out every bit of advice I had been given, i decided to take the system apart completely and build it outside of the case (not really thinking it would work) and to my amazement it booted perfectly. I then put everything back into the case (the only difference being new screws on the motherboard) and its working just fine now.

A friend told me the case must have been causing a short on the motherboard, but I still don't understand where or how???

Thanks to everyone who helped, you all kept my head up when I was getting pretty frustrated.