Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.
In a large skillet over medium heat, saute the ground beef for 5 minutes. Add the onion and saute for 5 to 10 more minutes. Season with garlic powder, salt and pepper to taste. Add the tomato sauce, stewed OR diced tomatoes, corn and cooked macaroni. Stir well and allow to heat through, about 5 to 7 minutes.