How Fix the Lego Mindstorms NXT "Clicking Brick" Problem
Lego Mindstorms NXT Robot
Fixing a clicking NXT brick
Help my expensive Lego Mindstorms NXT brick is dead! Is it? Put your ear right up to the Lego Mindstorms NXT Brick with fresh batteries and it turned on. Do you hear some clicking noise? It sounds kind of like a cricket crawled inside the brick. If you do, don't fret, your brick is not dead, its just in a COMA!
To wake your clicking Lego Mindstorms NXT brick from its COMA by pushing the hidden reset button found inside of the battery compartment. You'll need a paper clip to push this button.
Avoiding The Click of Death
To avoid the click of death in the future, don't pull out the USB cord before your program or firmware updates are finished downloading.
Also check the Lego Education web site for the latest patches and versions of the NXT Mindstorms software.
Flickering screen problems are a different matter and are addressed in this article. Click here for help with a Lego Mindstorms NXT with flickering screen.
Fix the Problem
I use NXTs in my summer robotics camps and there is nothing worse then having a brick fail in the middle of a hectic session. Another thing to try is wiping the memory clean and re configuring the brick.