Why isn't iTunes recognizing my iPhone?

I have an iPhone 3g and iTunes 10.6.3. I want to upload music from my iTunes library to my phone, but when I plug my phone in, it doesn't show up on iTunes. It was working fine the day before yesterday, but now it's just driving me insane.

Yes, i've tried unplugging it and reconnecting it, and closing iTunes and opening it again. Didn't work.

Reinstall iTunes.

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