Hey people. Ill keep this short. I got a Mac Pro with no hard drive or video card. I bought a Radeon 6870 to run in it since it is supposed to run out of the box in OSX Lion. Since the 6870 doesn't show bootscreen, will I be able to install OSX Lion off my USB drive? Basically since the hard drive is formatted, and if I plug in the USB drive, it should boot into the installer, correct? If so, will the 6870 have correct drivers to show the installation process? If not, what will I have to flash to the 6870 to make it show bootscreen and the installer? I got the XFX HD-687A-ZHFC, and I have 2 desktop PCs that I can use to flash if needed. Even the smallest bit of help is appreciated. Thanks a bunch in advance!