I tried turning off power multiple times, unplugging ets. It seems it may be more than just the button not working. This morning I was poking around on the keypad and found that if I select the measure board option from the keypad using the numbers then it will respond to the enter key to start the board measurement. When it starts up to the main menu it won't respond to the up/down arrows but I can select using a number. It comes up with option 1) as the default and it will respond to the "enter" key to select the project menu but once I am at the list of projects it will no longer respond to any of the keys. I took the keyboard side panel off and there is nothing that looks wrong. I still need to look underneath where the cables go to the computer. I tried reformatting and flashing the memory card but that did not change anything.