I'm running xubuntu on this motherboard and three sapphire 7950 graphics cards. The computer boots and works fine when I have just two of them installed, but when I attach the third the computer stops booting in the middle of the Xubuntu loading screen.
I don't think that this is being caused by lack of power because I'm using this 1600 Watt power supply and I'm able to navigate around the bios page just fine.
What could be causing this? Any suggestions on how to fix?
This is what I found when I go into advanced mode and look at the boot.log
and it keeps on giving me the message
udevd[340]: timeout: killing /sbin/modprobe -vb pci:XXXXXXXXXXXXXXXXXX [350]
When I do as khajvah suggests and enter advanced mode and then as root run sudo startx
I get
Fatal server error:
could not create lock file in /tmp/.tX1-lock
and
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error
xauth: error in locking authority file /root/.Xauthority
here is the whole message