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If you mean the DIC, then would pull the cluster to, pop the board, to check for cold solder joints, or just a loose header connector and the reason that is not displaying as you are working through the functions via the right pod.
If you mean HUD, then would look from the outside of the windshield in, to see if the mirror bracket broke or you don't have it adjusted correctly, and the reflection is just not aimed at the windshield so you can see it from the seat. Hence on the left hand pod, you have the up and down arrows to aim the reflection on the windshield. Also, you can turn the Hud off as well.
As Dano523 & weezon said it depends on specifically what you're referring to; the Driver Information Center (DIC) on the cluster between the speedometer & RPM and/or the Heads Up Dislplay (HUD) on the inside windshield.
If everything, check the 15A CLSTR/HUD fuse in the bottom of the passenger floor board