Not all HDMI is the same. The HDMI standard has been upgraded many times (1.0, 1.1, 1.2, 1.2a etc.) as capabilities and the resultant bandwidth demands have increased. If your HDMI cable is 9 years old it may not be up to the bandwidth requirements of your new TV, especially that it is 4k. 4k resolution at 60 FPS requires an HDMI 2.0 cable.
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