Basically, the display just disappeared. All I see is a blank display with question marks and some weird symbol coming and going. I couldn't find anything online or on their website regarding this so if anyone knows what I'm talking about, I'd appreciate some input.

 

I have not had this issue but some things worth trying may be to:

-check your connections
-disconnect the battery
-toggle the pins

I have no way of diagnosing whether the unit itself is messed up but those simple steps might work out the bug(s).