"the printer is not connected" - computer idiot needs to know how to fix

I have two printers that have been working find with my iMac (OS Lion)...a Brother hl-2270dw and hl-2280dw. All of a sudden neither one will print. When I go to System Preferences I see the message "the computer is not connected." I'm really an idiot when it comes to fixing something like this. Is there someone who can walk me through the repair process?  Many thanks.

How are the printers connected?

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