sd card not printing

Hi all,
Attempting to separate from the computer and print from the SD card on my TAZ 5. I converted a file to gcode in Slic3r, dropped it into the SD card supplied with my printer. Heated the bed and nozzle and found the file I put on the SD, selected it. The LCD screen indicates it’s printing, but the print head has not moved. Any ideas as to why? I tried pausing and restarting the print, nuthin. Tried removing and reinserting the card, doing the whole process over again, still no movement… though the LCD is giving feedback that all systems are go.
Am I making a new user error that’s obvious to everyone but me?
thanks

p.s.,
I ran a trial print from the SD card first, printed the gears on the card. Didn’t get great results, but it did print.