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Q:

All electrical power failed on 2006 Mini Cooper S

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
- overheating sporadically
- died completely without any warning
- traveling normally at 35mph
(2) Answers
You need to have it looked at by a trained professional. There are too many potential causes and side effects of such an issues to try and diagnosing it without a proper fault scan and visual inspection. The only obvious thing you can check for is that the belt is still on the side of the engine.