I agree with the previous comment about checking the spring(s). The garage door openers typically have 2 safety settings, one for closing and one for opening. If a spring is broken or has come loose, then the opener has to lift a lot more weight, and it will typically trip the safety sensor.
If you cannot tell if the spring(s) damaged, pull the red handle and try to open the door manually, a properly balanced door can be opened by hand.
Once again, if this is an MVP opener, look at the lights at the back of the unit, these will typically tell you what the problem is.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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