How do I describe the booting sound of some electronic devices?
Solution 1:
If you're okay with using a little creative wording in your novel, you could describe the sound as a tintinnabulation.
a jingling or tinkling sound as if of bells
If you're looking for a mechanical sounding noise, you could use revving, whirring, or clanging.
If you're looking for a more futuristic, electronic sound, you could use blaring, bleeping or humming.
EDIT: After watching the example clip in your comment, I'm a little bit dizzy. I'm thinking I would call that sound a fitful shrill whining. But I'm not sure, it's a tough one.