The Canon EOS 300D is a 6.3-megapixel entry-level digital single-lens reflex camera.

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Why doesn't camera recognise a memory card is inserted

Camera is not writing files to the cf memory card and is saying a card is not inserted.

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maybe contacts are greasy. try to degrease it, any white spirit/alcohol will do. also, you might need to format/reformat the memory card using camera...

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I've also discovered that this happens because of a bent pin in the camera where the CompactFlash card plugs into the camera. Mine has been the two pins closest to the eject button.

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This can also be caused by a defective/broken CF door switch

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Could it be for any other situations, as I have done all checks and keep the problem.

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