Help with Dell T200 Printer and System

I cannot get my Dell T200 to print - we have the following:
Optiplex 745
Dell T200
Dell cash drawer set up
QuickBooks 6.0
I have tried all of the trouble shooters (in Windows Printer Help and system) and no luck.  I continue to get error msg when trying to print. 
When I have the Dell t200 connected to the cpu with the 9 pin cable that was included, it isn't even recognized by system.
When I use the USB connection, system recognizes the printer, but still won't print. 
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