If you are unable to record or take video one common cause is a full memory or missing memory card.
When the memory is full on your eyewear you will see the left side red and blue LED blinking. Connect your eyewear to a computer to download your files and empty the memory. You can also try using your operating system's built in utility to format the memory card. Please make sure to choose "FAT32" or "MS-DOS-FAT" if given the choice on the type of file system to use.
When there is no memory card in your eyewear you will be notified by a beep and the left and right side red LED light will blink. Insert a memory card and you will be good to go.
Another common cause is that your SD card is either missing or not fully inserted into the SMART frames. Unfold the left hinge and make sure that the SD card is fully inserted. You should hear and feel a small "click" when the card is properly seated.