only one of the 4 cards recognized anymore

When i got the nvidia driver working, i got this screen: http://img509.imageshack.us/my.php?image=schermafdrukto8.png
But after some reboots I only have 1 card recognized. Ideas anyone?

Did you change anything between rebooting (installing programs or updates)? Check your /etc/X11/xorg.conf file, or maybe try restoring a backup if you have one. Make sure SLI isn’t enabled?