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Things to check: Drive/Free wheeling switch, brake release lever (this activates an internal micro-switch that enable power to the drive system, battery box connectors (condition of contacts - corroded, missing, loose. etc.); main control cable (corrosion. lose or missing pins, etc). If all these are OK, could be controller or drive control potentiometers (speed, forward, backward) on the handle-bar (tiller). Good luck!
Laptops are so integrated that usually a system failure that involves power issues such as in your case where you cant get it turn on with anything on the screen mean the mainboard (motherboard) is damaged. This usually leads to buying a new laptop or paying for the board to be replaced which usually costs as much as the laptop.
there is a broken gear in the gear reduction box. (explain:) the motor spins at a high rpm, the chain moves at a 1/4 or less rpm than the motor. a series of gears reduces the speed, which in turn creates torque, allowing the saw to have the force to keep cutting without stopping. One of the gears is broken or a keyway on a shaft is sheared...as far as i know, no electrical power tools are rebuildable. it's a safety thing (electric shock if reassembled wrong...they are priced for replacement...get a new one...
the unit is 240 volts not 120 volts/its ok to have the wht and green tied together so long as it comes directly from the house main panel/new law in some places require them to be separate/wht=Neutral/Green=safety grd to case...now how many watts does this unit draw? 2/12 wires sound awful small for the input current/sounds like you need to upgrade to atleast 2#6 wires for power/1#8 for neutral and atleast a #10 for safety ground
Pull the power cord out of the back of the printer.
Then move the printhead to the center and pull out the ink and the printhead. Clean the printhead and examine the bottom for burned areas.
With the printhead still out, close the cover and plug the power in and turn the power on. If your printer isn't damaged, it should go through all diagnostics and give you a solic green light. This means you probably need a new printhead.