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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@JonoMarshall
You can use any disk from a similar model, or take it to the Apple store?
Or backup and re-install as an instant fix for any software based issue.
Could be the controller, logic board, etc... which means using an external for good unless you want to pay through the nose/have warranty.