Xbox 360 slim fan not working

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Jun 5, 2021
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So i bought a very old Xbox 360 on a garage sale and when i test it i saw the fan not spinning and there's a lot of dust in the console. Do u think the dust is the cause of the problem?
 
It very well could be, especially if it has been sitting in a humid location allowing the dust to solidify/harden sort of like "dust concrete".

Try cleaning and see if that resolves the issue.
 
then the connector is likely bad, not the fan, broken wires can be fixed or replaced.