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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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Polygon
Sumo
You can get a PCI diagnostic card which may tell you more https://www.amazon.co.uk/Motherboard-Diagnostic-Card-4-Digit-Analyzer-x/dp/B00H51J166 (I've never used this one, just the first that came up on Amazon).