If you mean it shows "offline" in Windows, you can sometimes just uncheck that checkmark from the properties menu and it comes online. This happens if the printer experiences a problem. The computer has no way of knowing that you fixed the problem so you have to tell it that you fixed the problem.
If you are talking about the printer not being online (the actual hardware) you can try clicking on the "reset dell printer" icon in windows. You may need to download this utility from dell.com.
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