Lumix DMC-LC33 system error

Press the MENU button, use left/right-arrow to select the wrench-and-screwdriver icon in the upper-right, then use up/down-arrow to select the "i+" icon.

The DMC-LC33 is designed to work with SD cards. Your 4GB card is actually an SDHC (Secure Digital High Capacity) card. While it fits into the slot it will not work. You need to use SD cards, 2GB and smaller.

Page 77 of the manual tells you how (There's a lot of symbols and screen prints - so I won't cut and paste it here).

Seems fairly straightforward

User manual is here (free download):
http://safemanuals.com/user-guide-instructions-owner-manual/PANASONIC/LUMIX%20DMC-LC33-_E

What is the error message and the brand of camera.

This normally happens when the memory card gets corrupt. Hope you have pressed OK after selecting YES. Check whether the card is locked. SD card has a small Lock button on the top left. If this fails, buy a new SD card and format it in the camera before taking any image.

Have you looked for the manual online from the Panasonic website? Just type in your model number on their support page and you should find the manual that will explain exactly the menu item that you need to find. Other than that, I'm sure there is an audio option on the system menu. The camera default is to be off because it uses a lot of extra memory to record sound.

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Replace- at this age not repair is likely

You could sent it away- I suspect the likely price will be more than a new camera however. So buy the new camera - then you have one to strip down your self if you are that way inclined.