It means you need to plug youy iPhone into iTunes on your computer. Before I give any other advice, what happened to cause this scree... anything in particular?
Unplug to from iTunes and reset it... press the home and sleep buttons until you see the Apple logo, ignoring the slider. Takes about 5-15 secs of button holding and you won't lose any data or settings.
If it doesn't boot up, connect to iTunes and Restore it from your backup.
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