Newbie's 1st build

I'm sure you're all tired of the noobs but i've run into a prob. machine posts, can get into bios , but when i try to load vista i get a screen with a progress bar says loading files, then blue background with cursor/timer then timer diappears and the sys just sets there. cursor still moves with mouse. here's my sys.
gigabyte p45-ud3r
evga gtx 260
WD 500gb black
4gb ocz plat 1066
600w ocz modstream psu
intel E8400
RAM posts as 4gb 1066
cpu posts at 3ghz
sys initially would not post
unplugged everything and restarted each time with one more hookup and now posts with everything