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First before you open the tool ground yourself. The switch is probably static sensitive. Now open the tool and check for wires that may have come loose from the switch, or motor brush area. If no bad wires make sure the switch terminals are ok (not broken or bent and are tight enough to make contact with the batery terminals). Next check the brushes and make sure they move freely in the brush holders. You didn't state the model so it may not have brushes you can access. If all that is good disconnect the motor from the switch and secure the motor in a vise. Take wires with alligator clips and connect the battery directly to the motor for just a second to see if it runs. If the motor runs you have a bad switch assuming your battery is charged.
first make sure brushes are not worn out and if not then replace the switch. the brake is contained in it to throw a short thru the motor when trigger released to stop drill. You can find a breakdown for this tool at Dewaltservicenet.com
yes this is normal the spark keeps motor from stalling out by taking away the friction spark by making own spark the clunk is the drill brake so you dont brake your hand when screw goes in all the way unlike old drills that kept going even when your hand was attached to it
We.ve the same problem with those Chinese batteries and find that this problem is quite wide spread with many brands using these batteries. I'm speaking from experience with our battery factories. No quality control!