si, la bateria interna de la c?mara esta agotada , por eso no puede mantener los ajustes permanentemente. tienes que mandar a reemplazar la bater?a interna .es como la de un reloj de mano .
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The LCD in the viewfinder likely has connection problems or broken circuits. Did you drop it recently? Was it subject to extreme temperature etc recently? You may find the lines shift around or even go away for some time. That would imply bad connections. If your technical enough to disassemble it, there is often a rubberised connector use between the LCD and circuit board that can be cleaned. It's delicate work tho.
Your camera may be manifesting shutter not opening problem. It needs to get to a camera service/repair shop.
However, it's good you physically check whether the lens isn't blocked or covered with anything
is the lock on the card by chance. also depending on how old the camera is and how big the sd card is in gb. the lumix may not be able to handle that size of card, too many gb. My lumix would only accept up to 4 gb, so when I moved to 16 they did not work.
Basically that will be extremely expensive, and probably not worth it. Resign yourself to the fact that the camera is fubar, and replace it with a newer model. Remember NOT to get sand in this one.
Normally above problem occurs when small cameras used near sea. High moisture, salty weather and sand accumulation creates above problem. Try a small drop of antitrust spray(WD40) after removing batteries.wait for 20mts operate switch slowly. Other wise switch to be replaced by camera technician.
Black screen after clicking a picture means aperture motor not working or lens flexible circuit damaged, it has to be checked by expert technician & is replaceable part.
This camera is now ten years old, and will only take an SD card, with a max limit of 2GB. It cannot recognise or use a more modern SDHC card, which is what I suspect you have been trying to use.