IPhone 4 stuck in recovery mode after screen change?

Basically I have recently changed the screen on my iPhone 4 and carried it all out properly (I've changed ios screens previously) however afterward the phone is just stuck in recovery mode with the connect to itunes symbols. Once I try to restore I just get an error (3014) which stops the process. The phone was 100% working before the screen change. Is this a hardware issue? I have checked all the ribbon cables several times. Any help would be greatly appreciated!

Hold the home button and power for a long while at the same time

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