Radeon 5770 in 2008 Mac Pro, won't boot - hangs at Apple logo screen??

Okay, so I had the Radeon 2600 XT and it kept giving me issues with pink & white checkerboards and freezing, then eventually wouldn't let me boot past the white/grey apple logo loading screen. Now, today I installed Apple Radeon 5770, just installed, got the MiniDisplay to DVI-D adapter and everything, but it STILL won't let me get past the white/grey apple screen! I can't seem to get the DVD drive to open either. Both of my hard drives have been working fine and I've even swapped slots and i still can't get past the white screen! What gives? I just dropped over $300 for this, so you can imagine my dismay and frustration. Can someone please help me with some ideas? Would be GREATLY appreciated.
It's a 2008 Mac Pro dual 2.8Ghz (3,1), running 10.5.8
M

Yeah, ok thanks for the response about the screen! So, I don't have 10.6.5. I'm running 10.5.8, which the Radeon 5770 says it needs 10.6.5, but -finally- I got my computer to boot up with the 5770 in it, on 10.5. Al I did was hold OPTION+ Power button and it took me to a blue screen, then to my 500 GB new HD. I then switched over to my other username on Macintosh HD (drive that came with the MacPro) and OSX loads fine! I can tell that it still needs to be on 10.6.5, so I can download the drivers because the text is ever so slightly fuzzy, and the color isn't tuned well (too much contrast) and images take a little longer to load/ are a bit laggy. I'm just glad it's up and running! No more pink transparent checkerboards, and loud *** fan sounds! I am wondering though, what was causing this hold up? Is it only booting up because I have the 10.5.2 install disc in the SuperDrive? I almost don't want to take it out and try without it, after the trouble i've had, just in case lol.  I'd like to have an idea as to why, because I don't want to mask a problem, and have it eventually turn into a catastrophe.

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