Found some solutions to help with driver issues that I experienced with video when imaging T5500, T3500, Optiplex 990.
If using Nvidia T5500 or T3500 please use the link http://www.nvidia.com/object/quadro-notebook-win7-winvista-64bit-296.35-whql-driver.html
** T3500 No Video Card or Sound Detected
** T5500 No Video Card or Sound Detected
If using the ATI Card in the Optiplex 990
Inside Drivers_postinstall folder Windows_7_x64 990 video folder
r3079914 <driver feed>
** 990 Crashed IE with Stock Dell Driver Feed Drivers and to download each one above with <downloaded>
Unpackage and put in your drivers_postinstall video folder for each system.