I've recorded a 7 second video of it here: http://youtu.be/2k9P59Z32wE. Basically, the screen will alternate between a fuzzy picture, color bars, and then black every ~2 seconds or so.
Technical details: I'm using a mini-DP to dual-DVI adapter with a dell 3007 wfp with a late 2013 macbook pro (with nvidia graphics). I've been using this setup for several months now. I've confirmed it's an OSX issue because my display works with my bootcamp partition, and another windows machine.
This started happening yesterday after my mac froze when I attached it to my display. I had to do a hard reboot, and I suspect this may have corrupted some system files. I've tried doing PRAM/SMC resets, and also following suggestions to delete com.apple.windowserver.* files (http://foliovision.com/2009/12/apple-dual-dvi-mini-displayport-adapter-mb571z). No luck so far.
I'm thinking about just doing a fresh install and then migrating my data to fix this. Any better solutions?
edit:
Looks like my adapter is broken. I only tested lower resolutions, not 2560×1600, when on my window machine/bootcamp! Thanks for all the help.
Best Answer
If the issue potentially has to do with corrupt files, you can try booting from the OS X disk and running disk repair to see if that fixes the problem.