Yeah, my favorite sound is still the Obsidian font, but something, not necessarily more broken, but angrier, would be cool.
The "Snap/hiss" of powering up with a little more hiss "like opening and igniting an acetylene torch, but with the electric hum and wail of a capacitor charging.
The baseline Humm broken up with the ocassional crackle like a small static discharge and a background whistle of gas escaping through a valve
and clash/ lockup sounds that crackle and boom like lightning or explosions.
And a power down that includes a couple of a couple of "coughing backfires" like a poorly tuned car's exhaust, or a propane heater shut off by cutting off its fuel supply.
Yup, that's pretty much exactly what I was imagining in a font.
Just lots of extra noise, for lack of a better word, mixed in with a standard hum.