If you have debris or junk buildup inside pump - protection would kick in, pump clicks and stops. If control board failed = rma. Another common issue with loose power cable.
Don't worry small cable, it makes no difference whatsoever except pump going half speed. So forget out all bullshit tricks you were advised above. Most likely you have the power issue with MOLEX 4-pin connector. Make sure that there is power out of your PSU by plugging something else to test
It also seems like you tube completely collapsed going out of reservoir?