Did anyone ever figure out a fix? I've been struggling with this for the last couple weeks and am not making any progress. I'm not really sure what caused my problem since I've been doing so much to my computer. I've added the Apple RAID Card with 4x750GB, moved all my old drives to a 4-Bay eSata enclosure running off the logic board, played with rEFIt a little bit, apparently ran the update as it isn't prompting me to do it, installed Leopard, yada yada.
I've tried booting off of every bootable OS cd that I have in my possession, switched monitors, removed rEFIt. My monitors are getting a signal as the monitors never go amber but it's just displaying a pure black screen. In another week or so I'm going to swap video cards with my friends 7300GT so that I can eliminate the ATI card from the equation.
Here's a list of everything that I've done to the machine. Very little is still stock...
8x2.33GHz Xeon's
6GB RAM
ATI x1900XT
Apple RAID Card, 4x750GB RAID5
Running four external drives off the Logic Board iPass connector