Double check you connections, by disconnecting them and reconnecting them. This is a common problem. If you have a clear picture without lines or blackouts that means your lcd is fine.
If your touch still isn't restored. Try again once more. To make sure that the connections isn't the issue.
If still no prevail, reattach the old digitizer to make sure that some thing didn't shirt out. If the old one works, the the problem lies with the replacement. inspect the ribbon wires attached to the replacement for bends or creases. If nothing can be visibly seen. It's likely you just bought a did. It happens more often then you would like to think. If that's the case, you need to contact the seller for a replacement or refund.
Good luck.
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