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First reboot the set by unplugging the set from wall-power wait 5 mins then re-plug back in again retry the task, then if still the same go into the settings menu of the set and look for a factory or shipping default setting and activate this you will lose all previous settigs and if you are using a antenna will need to re-tune
Let me know how this works out for a first couple of checks
Sorry I will have to opt out here
Hello are these single jpeg files on the USB stick or a slideshow file?If a single jpeg files please attach one that doesn't work to your reply by clicking the paper click icon in the above menu box so that I can look at the file and see what could be going on.