My printer says it is offline and now it wont print

Check out this article and follow the instructions to fix the problem.
How To Fix My Hp Printer is Offline Problem HP Printer Says

Hi,
perform the steps below if the Operating System is XP
Step 1:
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Determine if the printer is paused or offline :
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1.Open the printers folder, if necessary.
a.Click the Start icon.
b.Click Control Panel.
c.Click Hardware & Sounds.
NOTE: This step is not required when using Classic view in Windows Vista.
d.Click Printers.

2.Right-click the name of the printer and then click Open.
3.Click Printer.
4.Verify that Pause Printing and Use Printer Offline are not selected.
5.Press Esc to close the window without making any changes.
Step 2:
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Check for the default printer and USe printer Online in the printers and faxes folder.
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Click Start -->> Control panel -->> Hardware and sound-->> Printers-->>Change default printer. ---> Please Right Click on the printer icon which has tick mark and Select the options Use printer Online and Set as Default and also Select the option Resume printing.