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Ok, it's a serger. Wondered why a sewing machine would be cutting unless it had the cut-n-sew accessory.
Most likely the blades are damaged or malfunctioning. Is the blade still moving when it is stitching? Is it just chomping away at the fabric but not cutting? If so, either or both blades need to be replaced. Consult your owner's manual. Usually only one blade can be installed without any technical knowledge. You can probably order the replacement blade and install it yourself. However, the other usually needs to be replaced by a knowledgeable technician because it requires some precision.
Has the blade stopped moving at all? If so, how long has it been since a thorough cleaning and oiling? Take it for service.
A riding mower has an interlock that prevents starting if no one is in the seat or if it is in gear or blade is engaged. Check these interlock switches. One of them may be shorted. Sometimes, the way they work is to kill the engine by shorting out the ignition. Other systems may prevent the starter from operating.
If the blade stops it could be from a loose hex bolt, flanges missing or you have a gear problem. UNPLUG tool and check the blade first. I would remove the fill screw on the gearcase and see if the oil has metal shavings in it, if it does the gears are worn allowing the blade to slip. If not I would recheck the blade. Did this suddenly happen and if so what did you do prior to your problem
Sounds to me like you have a low voltage short. If the stat had no display until you installed the battery means there was no voltage for the stat to work. Putting the battery in proves the stat works, no motors turning on probably leads to a blown low voltage fuse generally a blade fuse on circuit board in indoor unit. Good Luck