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The safety key for your treadmill model will need to be inserted into its slot, for the treadmill to run. The safety key looks like this :
One end clips to your clothing, the other end must be inserted into its slot in the console, before the treadmill will move or react to controls.
Check the power connections, of course, and turn the treadmill Off for 10 seconds, then On again, with its power switch near where the power cord goes into the treadmill.
Look there for another button or switch. There might be a breaker.