Hey ... no fair bashing Donnie Iris. Sure, he looked like a nerd, but that Pittsburgh native could ROCK. His signature song, "Ah Leah!", back around 1981, is one of the classics of FM rock stations. He also did "Love Is Like a Rock" which made it into the top 40. "Do You Compute" was around 1984, and was a rocking song as well. He was originally with the Jaggerz in the early 70's, who had a hit with "The Rapper". I think Donnie Iris still sells out at concerts at local clubs in the Pittsburgh area.
Oh, for the cabinet bootup song, just pick a classic arcade theme song, such as Pac Man or Donkey Kong. You can't go wrong. Maybe alternate from time to time. My kid hears the theme and comes running every time.