| Posted this in your other thread:
Do these displays have USB cables? If so, unplug and reset.
Try opening the Display pref while holding down the Option key to see if you get anything extra.
Did these monitors have any software that may need to be reinstalled?
If nothing helps you can dump the pref and get a new default:
From Apple:
Warning: This section involves use of the "rm" command. Be sure to type the commands exactly. Typographical error when using the rm command could result in severe data loss, up to and including all information on the computer. To verify characters and spacing, you may copy and paste the text from your web browser into a text editor, such as TextEdit.
1. Start up in single user mode by pressing and holding the Command-S key combination when you turn on the computer.
2. At the prompt, type: mount -uw /
3. Press Return.
4. Type: rm /Library/Preferences/com.apple.windowserver.plist
5. Press Return.
6. Type: reboot
7. Press Return.
When the computer restarts the preference is recreated with default settings.
Or you could dump the system prefs but that would mean resetting a lot of stuff.
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