How do i turn on my DMC-FZ20.its full of battery

The DMC-FZ20 works with MMC and SD cards, 2GB or smaller. Your 8GB card is an SDHC card, which fits into the slot but is electronically incompatible.

I never experienced anything like that with my old FZ20 but with experiences in other cameras I've found a nice, easy way of fixing things tends to be a "hard reboot" I think it's called. Turn the camera on, then remove the battery while it's still on causing the camera to shut down due to power failure. Put the battery back in and IME, all should be well.

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Assuming that the new battery you tried was the correct type for the camera and that it was fresh/fully charged, your problem may be due to corrosion on the battery contacts inside the camera which can prevent the full power of the batteries from flowing into the camera. Try this free fix before you do anything else: remove the batteries and wipe the camera contacts firmly with a dry cloth (heavy corrosion may require cleaning with a wire brush, steel wool, or sandpaper). Remove any residue that may have fallen into the battery compartment during cleaning, then wipe both ends of the batteries and place them back in the camera. This cleaning clears the problem about 90% of the time. If it doesn't work for you, your camera may have a problem that requires professional repair.

Hope you got the battery charger with the camera kit. Use it to charge the battery.

In the camera setup menu there is an option which says power saver......increase the time frame in power saver...it will solve the problem

try to help the lens come out by pulling it very very lightly...you should here a pop.

Mine fall of too, but fortunatly i found it..

You can put on 72mm filters, but you have to use the extension (sorry, but my english is not the best, and i don't know how it is called..)

In case new batteries will not solve your problem and since your camera is still under warranty you should ask Panasonice to take care for it !!!!! Good luck!