This is kind of a repost of a previous question, about a problem with
my Canon 8000F and connectivity. But this time there was an
additional error message running on piece of softwa "Unable to
Open Twain Source. Please Check Connection." I've inserted the
message, in sequence, in the discussion below -- maybe the extra clue
will help someone to help me.

I have the Canon 8000F scanner, which has been working fine for
several months with Windows 2000. Recently, after installing DSL, I
needed to rebuild the entire system (reinstall operating system, all
applications -- I did a clean build, but had to uninstall parts of
Service Pack 4, which may have hashed things) -- and now am having
problems. When I try to access the scanner from any app, including
the Canon Toolbox, I get: "Cannot communicate with scanner. Cable
may be disconnected. Check status. Scanner driver will be closed."
Then, next dialog box: "Unable to Open Twain Source. Please Check
Connection."

I have tried installed a different Twain driver, CFM, and that also
gives an error message. I went to the Microsoft download site and
searched for a Twain driver, and came up dry.

I notice that when Windows boots up, the scanner is not making the
noise it previously made, some kind of reboot, testing-the-scanner
sound. However, when the scanner is disconnected from the computer,
and reconnected to the USB port, Windows definitely announces "New
device found", and installs the scanner. The scanner is listed on the
Control Panel; under System/Device Manager, it says the device is
working properly. But under Scanners And Cameras the Status is
listed as "Unavailable".

The scanner remains connected to the same USB 2.0 port I used before
(though I also tried the other USB ports, and that didn't help). The
USB ports are working okay, because I test them with other devices, so
it's clearly a software problem. I have uninstalled the drivers, and
reinstalled with the latest from the Canon Web site. I have powered
the scanner off, and on again. I also tested the scanner with my
laptop, and the connection works fine there, so that scanner did not
mysteriously break, it's working okay.

I searched Usenet for previous posts on this problem, and found
several people who have experienced the same thing. Only, none of the
threads ended with a solution, other than: Reinstall everything from
scratch. (A solution I'd obviously rather avoid.)

Finally, in desperation, I tried reinstalling Windows 2K SP 4 (in
spite of other problems that causes), and it didn't help. Any
suggestions -- other than, "Rebuild the entire system AGAIN..." would
be appreciated.

Steve O.


Standard Antiflame Disclaimer: Please don't flame me. I may actually *be* an idiot, but even idiots have feelings.