I've read a few other threads about the HUD having a broken spring.
My HUD is working and I had to lower my seat an inch or two and I can see it on the windshield.
I've already had it apart and I found the motor to adjust the mirror was unplugged. The springs for the mirror are intact from what I could see unless I was looking in the wrong place - some of the embedded images were missing. Is the motor a common failure? I plan to take it out again and do more of a bench test (wiring directly to the motor pigtail to see if I can get the thing to move.)