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Can't connect USB printer to Macbook Pro
- Thread starter sammik
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which printer, have you tried installing any software either from a disk or from the manufacturers website
Both ends of USB cable connected firmly? Printer turned on? 
Have you tried a different USB cable?
Also -- you've said MacPro in one spot, Macbook Pro in another. They're different machines, so it might be worthwhile to clarify which one you're talking about -- though it shouldn't really matter.
As nunes013 asks, what is the printer and did it come with any drivers on a disk or downloaded from the manufacturer's website?
It'd be best to give more detail as to what you're doing and what the setup is; your question as asked isn't much different from telling a mechanic "my car doesn't work, what's wrong?"
Have you tried a different USB cable?
Also -- you've said MacPro in one spot, Macbook Pro in another. They're different machines, so it might be worthwhile to clarify which one you're talking about -- though it shouldn't really matter.
As nunes013 asks, what is the printer and did it come with any drivers on a disk or downloaded from the manufacturer's website?
It'd be best to give more detail as to what you're doing and what the setup is; your question as asked isn't much different from telling a mechanic "my car doesn't work, what's wrong?"
In the printer setup, press the little "+" button. Any new printer is detected just fine, but not automatically added to your list of printers. Where I'm working there is about a dozen printers that are detected; would be ridiculous if they were all added automatically to my printer list.