Start by ensuring the machine has a stable power source. For corded models, confirm the plug is fully inserted into a working outlet. Inspect the power cord for any signs of damage like fraying or cracks, which can disrupt electrical flow. Try connecting the machine to a different outlet to eliminate issues with the original power source. For cordless models, check that the battery is properly seated in its compartment and has enough charge. Loose connections often cause startup failures, so ensure all power-related parts fit securely.

Inspect the on/off switch and any control buttons for damage or blockages. Dust, debris, or corrosion can prevent switches from making proper contact. Use a dry cloth to gently wipe the switch surface and remove any buildup. Press the switch firmly to check for a clear clicking sound, which indicates it is engaging correctly. If the machine has safety locks or trigger mechanisms, verify they are disengaged according to the manufacturer's guidelines—some models remain inactive if safety features are accidentally activated.

If power and switches seem functional, check for blockages in moving parts. Metal shavings, debris, or tangled material can jam the motor or blades, stopping startup. Carefully open accessible housing and use a soft brush to clear obstructions around the motor and gears. Check if cutting blades are properly aligned, as misalignment can strain the motor. If the motor makes a humming noise but doesn't start, it may be overheated—allow it to cool completely before attempting to use it again.

If previous steps don't work, internal components might be faulty. With the power disconnected, open the machine's casing to inspect wiring for looseness and resecure any loose connections. Look for signs of burnt parts or damaged fuses, which signal electrical issues. For cordless models, test the battery with a charger to ensure it holds a charge, as weak batteries often cause startup problems. If you notice internal damage or lack repair experience, consult a professional service to avoid further harm to the machine.