IPhone 4 doesn't do anything when plugged into computer

I have an iPhone 4 and it won't do anything when I plug it into my computer to connect to iTunes. I have had it for over 1 year and it works fine when it's plugged into my iHome. I've tried restarting my computer, turning off my phone, plugged the cord into a different outlet, but still nothing! What gives? I haven't had any problems with it until recently. I really wanna sync my phone to my iTunes so I can get new songs on there! It's so frustrating! Can someone help me please!

Try holding the power button and home button for 20 seconds while plug to the computer.

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