Interestingly, GraphicsEnabler=Yes. In the past, I've seen GraphicsEnabler=Yes for natively supported cards yield a black screen. Not so here.
The differences are the monitor (although the resolution is the same), and the CPU. Maybe the RAM size (16GB)
Time to put this machine back together.
Thanks for trying it. I have 8GB RAM, but I don't think that would matter. If I have GraphicsEnabler=Yes then I get a black screen under all circumstances (I can log in from another computer and see the desktop, but can't see it locally). I wonder if my UEFI could be screwed up. I don't see any errors when holding the DELETE button during start up and am able to change settings. I think it should be okay, but something is wrong..
EDIT: Can anything be gleaned from the Console report? It seems unhappy.
10/13/12 7:03:26.837 PM ReportCrash[4805]: Saved crash report for mobile_fs_util[4827] version ??? to /Users/jonah/Library/Logs/DiagnosticReports/mobile_fs_util_2012-10-13-190326_Craigs-Mac-Pro-3.crash
10/13/12 7:03:34.486 PM com.apple.launchd.peruser.506[189]: (org.thebends.iphonedisk.mobile_fs_util[4833]) Job appears to have crashed: Trace/BPT trap: 5
10/13/12 7:03:34.486 PM com.apple.launchd.peruser.506[189]: (org.thebends.iphonedisk.mobile_fs_util) Throttling respawn: Will start in 10 seconds
10/13/12 7:03:34.490 PM ReportCrash[4824]: Saved crash report for mobile_fs_util[4833] version ??? to /Users/craig/Library/Logs/DiagnosticReports/mobile_fs_util_2012-10-13-190334_Craigs-Mac-Pro-3.crash
10/13/12 7:03:34.493 PM ReportCrash[4824]: Removing excessive log: file://localhost/Users/craig/Library/Logs/DiagnosticReports/mobile_fs_util_2012-10-13-190013_Craigs-Mac-Pro-3.crash
10/13/12 7:03:35.031 PM com.apple.launchd.peruser.506[189]: (VineServer[4836]) open("/Library/Logs/VineServer.log", ...): 13: Permission denied
10/13/12 7:03:35.037 PM com.apple.launchd.peruser.506[189]: (VineServer[4836]) open("/Library/Logs/VineServer.log", ...): 13: Permission denied
10/13/12 7:03:35.091 PM OSXvnc-server[4836]: Arguments: -rfbport 5900 -desktop Gapple -rfbauth /Library/Application Support/VineServer/.vinevncauth -SystemServer 1 -restartonuserswitch N -UnicodeKeyboard 0 -keyboardLoading N -pressModsForKeys N -EventTap 3 -EventSource 2 -swapButtons -rendezvous Y
10/13/12 7:03:35.092 PM OSXvnc-server[4836]: Main Bundle: /Library/Application Support/VineServer
10/13/12 7:03:35.102 PM OSXvnc-server[4836]: Loading Bundle /Library/Application Support/VineServer/Resources/TigerBundle.bundle
10/13/12 7:03:35.109 PM OSXvnc-server[4836]: Running in Little Endian
10/13/12 7:03:35.114 PM OSXvnc-server[4836]: Using Private Event Source
10/13/12 7:03:35.115 PM OSXvnc-server[4836]: Using Smart Event Tap -- HID for console user
10/13/12 7:03:35.116 PM OSXvnc-server[4836]: Waiting for clients
10/13/12 7:03:35.117 PM OSXvnc-server[4836]: Failed to Bind Socket: Port 5900 may be in use by another VNC
10/13/12 7:03:35.124 PM com.apple.launchd.peruser.506[189]: (VineServer[4836]) Exited with code: 250
10/13/12 7:03:35.124 PM com.apple.launchd.peruser.506[189]: (VineServer) Throttling respawn: Will start in 10 seconds
10/13/12 7:03:36.869 PM ReportCrash[4805]: Saved crash report for mobile_fs_util[4837] version ??? to /Users/jonah/Library/Logs/DiagnosticReports/mobile_fs_util_2012-10-13-190336_Craigs-Mac-Pro-3.crash