My HP printer is offline, how do I get back online and working?

Hi,

1.       Did you make any changes to the computer before the issue occurred?

2.       What is the model number of the printer?

Method 1: I would suggest you to follow the steps provided below and check if it helps:

a.       Open the Start menu, click on control panel and click on the "Printers and Faxes" icon. This will open a window with a list of the printers currently set up on your computer.
b.       Double-click on the icon of the printer you want to change to online. A pop-up window detailing all current print jobs will open.
c.       Go to "Printer" in the menu bar of the pop-up window and uncheck "Use Printer Offline." This action will change the printer from offline to online.

Method 2: Try to run the Fix it from the link below.

http://support.microsoft.com/kb/2027593

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base.
How to back up and restore the registry in Windows

For your reference: http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02221706&lang=en&cc=us&taskId=101&contentType=SupportFAQ&prodSeriesId=3984415&prodTypeId=18972

Hope this information is helpful.