6870 Wont display on my monitor

I have recently just built this system and I've had it running for a couple of days, i was in the middle of playing a game and the monitor stopped displaying the image, i did a slight overclock on the GPU only to 950mhz up from 900. and i Overclocked the CPU to 4400ghz but that shouldn't be the problem because i have taken the GPU out and plugged the monitor into the MB instead and everything works fine. I have also uninstalled the AMD drivers and tried running the GPU again but no luck.

My system specs are:

CPU: Intel CPU Core i5 2500K Sandybridge LGA1155
PSU: corsair v2 80+ 600w
Heatsink: Coolermaster 412s
Mobo: gigabyte z77-d3h
RAM: G-Skill 8GB(2x4gb) RipjawsX DDR3 Memory PC3-12800 1600MHz 1.5V
GPU: Sapphire Graphics Card HD 6870 1GB GDDR5
HDD: Seagate 1.0TB hard disk drive Barracuda SATA III 64MB cache 7200rpm

Has anyone else had any issues like this? Will i need to replace the GPU?
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More about 6870 wont display monitor
  1. also the fan spins on the GPU when the computer is on, but it wont show any image
  2. i have tried swapping the pcie slot the card goes in aswell, and still nothing :/
  3. Could be a broken GPU - try it out in another PC if possible, if it does not work then it might as well be dead.
  4. I have no access to another system to try this, but i tried to turn my computer on and there was an image but there was two glitchy lines going up the screen about 1inch thick.

    Then i tried a reboot, PCIe slot change, and nothing is working.
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