New build help

[duscero]

I've just recently built my first computer, and I have one problem. When I switch the computer on, all the fans and LEDs turn on, but I don't get any picture on my moniter. I know the video card is connected to the PSU because the fan on it spins when the computer it on. I've triple checked everything, and I can't seem to find the problem. (I haven't installed the OS) Help?

Thanks in advance

Heres my build:
CPU - Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623I52500K

HDD - Seagate Barracuda ST2000DM001 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive

RAM - G.SKILL Ares Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-1600C9D-8GAB

MotherBoard - ASUS P8Z68-V LX LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS

PSU - CORSAIR Enthusiast Series TX650 V2 650W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply

Video Card - XFX HD-687A-ZHFC Radeon HD 6870 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card

Moniter - SAMSUNG B150 Series S19B150N Black 18.5" 5ms GTG Widescreen LED Monitor 200 cd/m2 DCR Mega 8 (600:1)

 

[bpm55]

try removing the card and using the onboard.
Plug into the hdmi or other video connector on the motherboard.

 

[webster247]

Sometimes (10-15% of the time) the 2tb hard drive is to big for the motherbord to register, try useing a 500gb (or smaller) main and running the 2tb as the slave (storage).
(If that was successful) then you have installed the operating system, you may need to go into "Computer Management" to partition the 2tb for the os to reconize the discdrive.
(NOT 100% SURE THIS WILL WORK, BUT IT WILL NOT HURT TO TRY)

 

[computerrepair]

I agree on pulling out the video card and trying onboard. Had the same problem and I ended up having to update bios to get my video card recognized properly.