Why won't my computer sync to my iPhone?

My computer crashed but everything had been restored to its original state. I have the same iPhone. When I download music onto my phone it will transfer into my iTunes but I have not been able to re-sync even one song to my phone. How can I fix this? I have already tried the obvious: plugging my phone in, clicking the sync button, backing up my phone.

Have you tried restoring the iOS then restoring the back up?

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