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Canon 500F Scanner Cannot TWAIN

I recently received an opened-box Canon Canoscan 500F scanner as a gift.  After installing the software from a CD and attempting my first scan, an error code 201 was produced as indicated below:

Error in scanner.  Turn off scanner and follow instructions in manual.  Scanner driver will be closed (code:201).  

The scanner attempts a warm up procedure three or four times and then stops.  
The unlock button has been exercised multiple times.
The drivers have been installed and reinstalled many times.
Three different computers and two operating systems have been tried (Win 2K and Win XP).
The latest driver has been downloaded from Canon and applied.
The results are consistent on all three computers.

I am out of ideas and any assistance would be appreciated.  

 


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AnilKumarSharma
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if the above does not help, i fear for a bad unit; have a warranty replacement.
you can also test it on another PC, to be sure
..and yes, first install software -then connect the device !
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ASKER

AnilKumarSharma and Nobus,

Thank you for your comments.  The detailed comments are especially appreciated.  

Yes I followed the Quick Start Guide.  My OS installs were done by cloning a fresh- install master drive or by directly doing a fresh install.  I do download updates from Microsoft and I do standard maintenance procedure on my PCs (remove excess files, do virus scans, correct registry errors, and defrag hard drives).  

One thing I forget to mention is that two of my test PCs are minimal units having only
175 watt power supplies.

I will follow the detailed instructions and report back tomorrow.  Thanks again.  
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Thank you for your helpful comments.  Though my scanner appears to be defective, I learned a lot from the comments to my question.  
tx for the feedback !