I have an iMac and also a MacBook. All of a sudden my iMac does not recognise my Canon 500D camera even though I have downloaded 1000s of photographs from it via the USB port.  The MacBook recognises the camera immediately. Can anyone help?

I have an iMac and also a MacBook. All of a sudden my iMac does not recognise my Canon 500D camera even though I have downloaded 1000s of photographs from it via the USB port.  The MacBook recognises the camera immediately. Can anyone help?

Thank you for your reply.  I know I can use a card reader however I don't see why I should when importing directly from my camera has worked reliably for years.  The process I use is simply connecting the digital output from my camera to the USB port on the iMac, which has previously automatically opened iPhoto ready for the import.  Now all of a sudden my iMac does not recognise the camera.  However if I connect in the same way to my MacBook then iPhoto opens automatically on the MacBook, recognises the camera and is ready for importing.  So whilst I know I can use a reader, or my MacBook I want to use my iMac in the same way that I have for years.  I can only assume that the settings on the iMac may have changed, but I cannot verify this.

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