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Both sensors will have their green led lights lit (on) when aligned. When not aligned only one sensor will be lit.
Make sure both sensors' lens are clean.
If still not aligned loosen the lit sensor from its mounting bracket using the proper tool, but most LiftMasters have a wing nut mounting for the sensors.
Aim the free sensor in the direction of the unlit one and look for its led to light. If necessary, using a screw driver remove the staples securing the sensor wiring enough to physically place the sensors eye ball to eye ball looking for the unlit sensor to light. If the unlit sensor still won't light then there is a broken or pinched wires some where between the unlit sensor and the garage door opener.
If the main light flashes 10 times it is a door sensor problem. If the main light does not flash then you can try increasing the down force. This is a control on the rear of the motor unit near where all those white wires go. If this doesn't help you probably have a bad infra red sensor board. This is a small printed circuit board just in front of the motor.
There isn't a fuse. You are going to need to remove the cover on the opener and find out where you are losing the power. Maybe a neighbor has a volt meter you could use. I would check the power cord and then the logic board. Makes no sense but I would check for burnt or missing traces on the printed circuit board especially around that small transformer.
Check the laser. Make sure that the safety lasers are properly alligned, If the bottom sensors next to the floor on the door rails sounds like it has been moved and just needs to be realigned. Pretty simple work to take care of the problem unless the sensor is broken