If the battery is drained on your iPhone 4, you really need to wait longer before it charges. Make sure you charge it with a wall charger because it charges faster than when plugged in on your computer. Also, if you have an iPad charger, it would be better since it has higher voltage and will give your phone more juice faster.
Just leave it for a while and it will boot in itself once it got the right amount of power. You may also try hard reset by pressing home button and sleep button simultaneously until you see the apple logo.
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