So I'm putting together a build everything was fine but I didn't have a gpu yet, bought my 660 ti msi pe. booted up the computer downloaded drivers and it crashed my ssd (positive) so I went and got a hdd booted from a previous state. Now I go to boot I get the windows 7 loading screen but before I can get to the log in it says no signal and gives me a black screen. what could be causing this? please help