All right so along the same lines, I have two Nvidia 7800 graphics cards on a 
SLI Bridge. I booted up and installed the Intrepid Ibex AMD64 live cd 
perfectly, it recognized, installed and rebooted using the Nvidia drivers. I 
started doing the Intrepid system updates and now it boots to a CL. when I 
login, I try to start x and it says the same as the OP:
...
Primary device is not PCI
(EE) No device detected.

Fatat server error:
no screens found
-- stopped for few seconds --
giving up.
xinit: Connection refused (errno 111): unable to connect to X server
xinit: No such process (errno 3): server error.

It says that verbatim, so I started trying what ya'll suggested (except
using the i386 version, I can't).  This is concerning because it worked
off the live cd but an update prompted it to do this. I don't know what
else to try. I know that:

You have 2 graphic cards and xorg doesn't know which one to choose as primary 
adapter. You need to define it in section "Device" of your xorg.conf config 
file with a line like:
BusID "PCI:02:00:00"

didnt't work for me so what's next?

-- 
[intrepid] X11: no device detected
https://bugs.launchpad.net/bugs/267241
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