Just a note to inform you that I have had this problem twice - Once 2 years ago while it was still under guarantee (DSC-F717) - Sony said it had nothing wrong and that I should refrain from using other than their memory sticks... Anyway, this morning, it started again with the memory error - same dreaded message - ... I hesitated before banging it but decided to do it anyway - just a slight thumb on the lens cylinder - It WORKED!!! - Tried it will all my memory stick (even my newer Lexar 4 GIG stick!). Thanks again for the tip! Robert

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