Hi guys. I just got my new ATI HD 5770 graphics card and installed it properly. I even watched a thingy on Youtube about how to do it so I know it's right. I turn the computer on...... It chimes....... then my screen turns white. I can hear the card's fan working. Then I see the apple on my screen and then I get the round thing turning round and round. Then.... Then nothing. Card's fan slows. Monitor tell me "No Signal". Computer is on and running. Card is working, but now nothing on screen. No signal after booting, but boot screen was displayed. I am running Lion 10.7 on a 2006 1,1. Any ideas?