When I upgraded my Mac Pro HDs I lost the capcity for 2 monitors.  One monitor works fine but the second one is not "seen" by the Mac Pro.  Help?

My MacPro is a dual quad core 2.8 intell processor system with 6 gig of RAM and 4 HDs.  I recently upgraded the HDs from 500 gig each to 2 TB each.  I did that by copying each existing hard drive to a new hard drive and then inserting the new hard drive where the copied drive had been.  I followed all of the instructions for the OX system that came after copying and replacing the drive with the OX on it.  Unfortunately now I can no longer use the 2 monitors that I used to use on the system.  One monitor works fine, the second on is not found by the OX system and simply won't respond or receive a signal from the computer.  Any ideas?

Have you tried a NVRAM / PRAM reset?
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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