Small Engine Troubleshooting Problems? Ask a Mechanic Now.
If you try to reset the breaker while the motor is still warm it pisdibly not reset. The loud noise after replacing the blade is definately a warning. An unbalanced blade would cause a noticable shaking or vibration but that could still be the problem. Check your blade with the key out . It should turn freely . If there is a lot of resistance remove the blade and reinstall checking the manual for proper fit. If the blade looks like a part of it is broken off get a new blade.
There are numerous places where the problem could be but the circuit breaker not feeling right and the motor quiting while noisy brings me back to that area as the problem . Try resetting the circuit breaker with the motir cold ( you probably already have ) if it still wont reset ( it should feel normal) if not it is possibly bad abd should be replaced
If the blade is bent in any way it could cause the noise.
Having teo troubles at the same tine may seem unkikely but it does happen. Getting back to the blade make dure everything is absolutely right in that area. Nothing around shaft, string , wire, etc, (it can look like grass) if something heavy was hit with the blade the shaft could be out of line.
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Just in case you dont have this.
Sorry that might be a bad link try this if it wont work.
If the blade is questionable, been sharpened a lot , nicked , been bent and straightened , it should be replaced