After installing new GPU, PC boots but no display.

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TuxNTopHat

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Feb 23, 2013
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I just got a Radeon HD 7970 and installed it. The PC turns on, fans spinning even on the GPU, but no display at all. Using the HDMI plug in the motherboard gives the same result. However when the GPU is not installed, everything works perfectly, as it has for 6 months. Also, when the GPU is in, the 'VGA LED' light next to the PCI slot on my Asus Z77 Sabertooth motherboard is a solid red.

I've tried disabling the Intel HD graphics, uninstalling all drivers, installing all drivers, changing PCI slot, using different power cables...

I'm guessing the GPU is broken? I've been testing this thing in many ways trying many fixes for 8 hours, I really need an educated opinion/answer. This almost makes me sick of PC building.
 
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TuxNTopHat

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Feb 23, 2013
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Thermaltake SMART M850w is the PSU.
Thanks for replying with something, I didn't know this was too popular a website.
 
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TuxNTopHat

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Feb 23, 2013
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I have made sure everything was plugged in right, many times...
I have uninstall the drivers, install GPU, then boot.
I did not however reset the CMOS.. I'm unfamiliar with that actually.
 
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