MaxPower But the display itself is the problem? How is that possible?
Any device can break, at any time. Shipping is a time when some devices break.
If you have tested the display with something other than the Pixel 8 (such as a laptop), and it works, then likely the display is fine. If there is no evidence that the display is fine, maybe it isn't fine.
Is the cable in question one that has previously been used to display video? Lots of cables that have the right plugs on the ends don't work well, or at all, for a specific purpose.
Overall, it would be helpful if more details were provided.