i tried to reset my iphone 6. now it wont come on. just a black screen with apple logo that somtimes blinks. i tried to restore and update on computer but it says error 4014

This could only means two things, the device is not communicating properly with the server or internal logic board damage.

Verify the following things, restart your computer, verify you’re running on the latest iTunes version, connected to a good known internet network, use different lighting cable, different USB port, clean charging connector of device.

If issue persist, visit the Genius Bar & Forum at your local store for a whole unit replacement, quoted at $299 USD plus tax.