Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Please tell me what the full model # ***** your StrengthMaster is.
Do you observe any lights on the circuit boards?
Have you recently done adjustments on the tension of the belt? does the belt show any signs of fraying or severe wear?
That sounds, speaking honestly, quite bad. One of those LED lights should light up, even if only to flash red indicating an error.
Does anything show on the control panel? e.g. when you flip the power switch on the control panel, does anything light up?
If not, look for a switch or push-button near where the power cord goes into the machine. If one is found, push it, or change its position. That might be the breaker switch for the whole machine.
Try a reset of the breaker switch nonetheless... it's worth trying, once, in these circumstances.
The next question is, the condition of the belt on this treadmill.
The belt may need readjusting, and lubrication (with the special, non-grease, lubricant these treadmill belts generally require.)
The belt should be adjusted, generally speaking, so that it is loose enough that it does not quite slip, but nearly that loose.
If the belt is adjusted (or, has shrunk up with age, and lack of lubricant...) too tightly, then it can stop the treadmill from working or running. An over-tight treadmill belt can cause wear, or even damage, in many other ways, such as by overheating the motor.
Which circuit board do you wish to buy (and yes, that could be the problem, esp. since power is verified as OK and there are no lights On, on the board...) - is it the only board in the machine?
We need to first off, identify that board, you know. Then it can be searched for and a source found for it... but please identify it just a bit, and if it's not the only board in the machine, please tell me where in the machine it is located. Thanks.
That would be good, but I may be able to identify without mistake if it's the only board in the machine (...doing a search...) ...without any indication of what MX seres # ***** model is, I can't be at all certain of it, or even that it might be this one:
I think it would be highly advisable that further action on this case be deferred to after you have gotten the board out and compared it to that one and also gotten any numbers off it.