Display System Preferences are More Limited after System Reinstall

Since doing a complete reinstall on my system drive, my 2 Dell monitors do not show up as "Dell 2405FPW." Before the reinstall both monitors showed up as Dells in the Display system preferences. Now one shows up as "Color LCD" and the other as "VGA Display." Now the display prefs are much more limited.
Any ideas how to get the computer to recognize the displays like it did before the reinstall?
Thanks!

Was there originally a software disc that came with your Dells, that may have installed a display preference file for them?
Maybe that will have to be installed, if it hasn't been.

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