Second monitor will no longer work with 10.9.3 update

Hi everyone,
I just updated to 10.9.3 and now my second monitor will not work. My Mac doesn't even recognize it.
I have a thunderbolt to Firewire connector on my Mac Pro going to a DVI connector to my monitor. I've repaired permissions and tried different ports, but nothing is happening.
Any suggestions?
Thanks.

Install the combo like kinman1 said. Mine was fixed afterwards too.
http://support.apple.com/kb/DL1746
After that you can also try a PRAM reset.
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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