hi i just put my new pc together consisting of a new 160gb sata, gigabyte p35, e6750. 4gb ddr2 800. and a evga 8800gt. i hooked everything up without a hitch i thought and i was successfully able to install vista but now i start up my pc and though i can see it boot up vista it becomes a black screen after im in on my lcd and on my crt the screen starts flickering and readjusting? But when i manually shut my pc down while its doing that the screen becomes normal again and i can see the boot down? please help thanks