How can I fix my treadmill (Proform XP550E)?

My Proform treadmill mod.# XP 550 E won't stay running and the console flickers. If I turn the fan on it will run a little while then flickers and stops running. If the fan is off it will start then shut off right away. The incline is not working. I checked connections on the curcuit boards on top and down below, all wiring looks good. I ran the re-calibration sequence but it's still the same. Any ideas?