Thank you Peter. I tried to install the AMD drivers. The installer generated a screen full of dependency problems. There does not seem to be a way to disable or dumb down the on chip video. Maybe the solution is to put in an old, Linux supported video card and force the bios to use it exclusively.
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I wonder if there is a way to force ClearOS and/or Linux to use an old/safe video mode.
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I may try to install a new version of another Linux distro to see if it will work, and then what graphics drivers it is using.
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If anyone has coax'd an AMD Ax-xxxx system into working with ClearOS, please share with us how you did it.
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I used this family of AMD CPU to build a Windows based Media PC. The on-chip graphics can handle the HD TV encoding quite well. The price/performance of this chip family is quite good.