Anti-Aliasing Breaks Game

[Shizniits]

It loaded fine, but AA was off, so I turned it on. When I turn on anti-aliasing the game screen turns white and begins flashing like a strobe light. Now I can't even load the game any more.

AMD 9370
Nvidia 670 GTX x 2 (SLI disabled, one dedicated to physx)
Samsung U28D590D 4k monitor (Did not have a chance to change the resolution, so it was not set to 4k at the time).

EDit: Forgot to add that I already read the pinned FAQ and none of the troubleshooting worked for me.

[Shizniits]

Still broken. Things I tried that did not work:

1) Everything in the FAQ. I think maybe it made it worse.
2) Clean install. No difference, which is weird since I the problem first happend when I changed graphics settings.
3) Praying to Jesus
4) Praying to Superman
5) Disabling AA directly through the NVidia control panel.
6) Resetting NVidia default settings back to default.
7) Clean isntallation of drivers. (Graphics, physx etc)
8) Clean installation of XNA 3.1
9) Clean installation of XNA 4.0
10) Cleaning my soul.
11) Praying to Jebus
12) Trying to figure out where the graphics settigns are stored for the game and hacking the damn thing (but I didn't know what the ♥♥♥♥ I was doing so ... yeah that went nowhere)
13) 42

I'm out of ideas...

[Inferus]

Same here