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Haha, the one time at 5k I took my GS in for service, they screwed up every single setting in the car including the HUD. It took me about 30 minutes to get it back on and adjusted right. I let them know they shouldn't play with the buttons when they are servicing it next time.
Make sure it wasn't adjusted too much up or down. If adjusted too much it may be out of your line of sight.
Apparently the guy that tinted my windows was messing with it and had it adjusted all the way up. Took a while to figure that out but its working. Good thing I figured it out before going to the dealer