Clean install of 4770 on ASUS p8z68-v LE

Having difficulty installing two radeon hd 4770s in my new build. I plan on running them in crossfire but I can't seem to install even one successfully. Whenever I try to boot with one installed i just get a black screen. Tapping/holding F5/F8/F11 have not worked to boot in safe mode. I disabled the Intel(R) HD Graphics Family and the display driver currently running is "Standard VGA Graphics Adapter." I've tried this with both of my 4770s, so I don't think this is a hardware issue.

My build-
mobo-ASUS P8z68-V LE
CPU -i5 2500k
PSU-corsair TX750M
SSD-Corsair accelerator 30gig

GPU- (2x) Radeon HD 4770

thanks for the help
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More about clean install 4770 asus p8z68
  1. Clean your system with CCleaner:
    http://www.piriform.com/CCLEANER

    Then uninstall the driver you have and run Driver Sweeper from Safe Mode (F8). Have it find and remove any AMD/ATI/Nvidia graphics driver remnants it finds.
    http://phyxion.net/item/driver-sweeper.html

    Reboot and install the latest driver for your card and O/S.
    http://support.amd.com/us/gpudownload/Pages/index.aspx
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