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Turned it facing down, lens extended, shook gently, gently brushed round housing with lens-brush: nothing in the way of sand or dirt. Removed batteries & card; replaced batteries, switched on Playback (usual screen, beeps, etc.); switched to Photography, screen blacked out, powered down within 10 secs, leaving lens extended (even when switched off). Turn on to Playback... screen alive, 'no card' message, red light turned to green, powered down and lens retracted! This looks like progress!
Carefully wiggled a piece of 80gsm paper in and around, nothing came out. Although I do now get a screen when in Photography mode, the screen does not show an inage, only a wavering, purplish faint image, with a slow shutter-speed (handshake warning).
No, warranty long expired, I'm afraid.
Sigh! 'Fleabay' as parts, then!