OSX hangs on startup after large file search caused a crash (Mavericks 10.9.5)

Well, my computer won't startup. Gray screen on regular startups, black screen with no cursor on safe mode startup.

It started after a everything froze while performing a massive file search in finder. I was looking through all pictures before Jan. 1st last year -- gigs and gigs and gigs of data -- and I was in the Cover Flow view. I noticed everything was slowing down, and while I was browsing, I tried opening a couple files, both in preview and in Photoshop. Both programs hung and eventually crashed.

Eventually, finder itself froze completely. I hard reset. Now, nothing boots.

I've tried moving the preferences files from Library/Preferences (finder, dock, systempreferences), no go. I tried moving the /Library/Preferences/com.apple.loginwindow.plist file and /Library/Preferences/com.apple.windowserver.plist file. No go.

I deleted all the caches from /Library, /System/Library, and /Users/myusername/Library/Caches.

Checked my hard drive with fsck and everything is fine. Also tried /usr/libexec/repair_packages --repair --standard-pkgs. Nada.

My last line in my boot log is UserEventAgent[11]: Captive: CNPluginHandler en1: Inactive.

If I boot to safe mode, the progress bar loads, it hangs on the gray screen for a while, it flashes blue for a split second and then hangs on the black screen.

Regular boot just hangs on the gray screen.

Any ideas?