On the way to Cozumel at Houston airport from Calif, I tried to adjust the local time on my near new D4i. I have had two dive trips with it; it is 6 months old. As I was adjusting the time, the computer locked up ie the buttons no longer responded and the computer went back to just a time display with no possibility of adjustment. i did a free dive with it as an experiment - it went into dive timer mode and gave me a NO CONN message but still no adjustments via buttons. I suppose the input circuit has gone dead on me and I have to send it back unless there is a clever trick to get the buttons to work again. I have soaked it, I have pushed all possible combinations of buttons to no avail. After a older D9 that gave no trouble for years, this is disappointing. Looks like i have to rent a computer.