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thanks for the helpful advice.

If the camera does power up, I'll do that.  I'll look at a picture of a white paper.  I have also used the technique of taking a time exposure of a fairly uniform bright surface while moving the camera.  The stationary dots must therefore be due to the sensor.

Yes, I am more interested in stills than video.  Good to know about the relative improvements in upgrading.

$390 sounds good for a replacement.  We'll see what happens.

Hadn't thought about travel insurance.  I know an accomplished amateur photographer who just rented gear and insured it when he traveled.

Tom