On Jun 11, 11:59*pm, Yousuf Khan wrote:
On 6/10/2010 7:07 AM, wrote:

I am reposting this with a different thread name because I now have a
quite different understanding now of what is going on. Although the
CCC interface works somewhat clumsily, when I reinstall CCC version
10.2 each time I reinstall it in fact, I am able to extend my screen
on to the second monitor. I see an icon for screen 1 and a separate
icon for screen 2 as I should and I can control the resolutions of
each monitor independently of the other. When I reboot, no matter what
I do, only the screen 1 icon appears and, although I can clone onto
the second monitor I cannot extend my main monitor desktop onto it.

It sounds like maybe you have multiple different versions of the driver
and/or software installed, and that somehow older versions are mixing
with newer versions. Try totally uninstalling all of the versions of the
ATI software, and reinstall only the lastest version after the reboot.

Coincidentally with every version of CCC I have used in Vista 64 I
have always had to reset the resolution (it defaults to 640 X 480)
after every reboot. Now it is bad enough having to reset the
resolution after every reboot. I would hate to think that I also have
to reinstall CCC after every reboot whenever I want to extend the main
screen onto a second monitor.

* * * * Yousuf Khan

Thanks Yousuf for the thoughtful reply. This seems like a very
plausible theory. I have always uninstalled CCC before installing a
different version but perhaps I have missed something. Other than
looking in “Programs and Features” is there any way to tell whether I
have older versions of the driver and/or software still working on the
system?