Computer turns on but screen stays black

Hello everyone. So I turn on my computer, I hear the fans working and everything but the screen stays black, and as soon as I hit the power button, the computer immediately shuts off, meaning it didn't boot. It doesn't even get to the motherboard screen/image. Any suggestions?
My specs are:
i5 2500k
Corsair 650w psu
Gigabyte radeon hd 6870
8gb ram
Gigabyte z68x-ud3h-b3 motherboard
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  1. Best answer
    Take the board outside the case, leave only CPU and CPU fan installed. Make sure that both 24 and 8 pin power cables are connected.
    Start the board. If the CPU fan is spinning, then turn off the computer, add one RAM stick, connect the monitor to the VGA or DVI onboard port, connect a DVD-ROM, keyboard, mouse and start the board.
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