Reebok irin model 14301?

The treadmill won't, yet the LCD display works fine and motor seems to be running. i turned everything off and disconnected from the mains for 30 seconds then turned it all on, Lcd display started counting but the Belt failed to move. Is this a motor or a broken drive belt or some thing come loose am. Please advise suggestions. Had since new about 4 years ago Thank you..