First thing I would do is tear it apart and inspect everything. 9 times out of 10 it is something related to shipping. Re-seat all the connectors and make sure there are no pins that are working their way out the back of the connector. Give it a good visual inspection and test anything that looks suspect. Remember these have been in a shipping container that might have been dropped a few feet. You see all kinds of crazy things down at the docks. It's best to find out just what the problem is before deciding that you can ignore it. While it might be something that is only related to the display, it could be something that will eventually cause other failures, like a bad supply regulator or something. If you have the skills to diagnose this to the component level, you will find it's not hard to get data sheets for just about everything in them. That is a big advantage in using standard parts. Makes for easy repairs and pretty easy to understand circuits.
Long arc, short arc, heliarc and in-the-dark!