Re: Crashing when SMP enabled
I don't see anything attached to your lastest post, however if you're seeing a crash when not using X at all, then you really need to start ruling out factors unrelated to the nvidia X driver.
Perhaps the system is overheating?
Perhaps you have faulty hardware?
Perhaps the BIOS has a bug?
Setting up a serial console would be a good first step to track down any kernel messages that are generated when the system hangs.
You really need to ensure that the system is stable without X before trying to debug a more complex setup that includes X.