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4 solutions to this problem: I went to the printer but nothing happened.
What is
1. Next time stay at your computer until the bubble pops up showing you actually printed it.
2. Make sure there's paper
3. See if any error lights are flashing (indicated a jam, for instance)
4. Figure out if you really sent it to this printer! E.g., go to reprint it and see what the default is set to.