For some reason my camera doesn't wanna turn-on

SOURCE: Need replacement instructions for my DMC-FZ30 digital camera

You can download required user manual from HERE or click Panasonic Support and type model number in box to get manual.

SOURCE: Panasonic DMC-FZ30 does not power up

remove memory card then try also refix batery and clean dust form it.

SOURCE: lumix DMC- FZ30 - screen is black when camera is turned on

Hello,
I understand that you've tried all the obvious tricks like resetting to factory settings etc.
Sounds like a CCD/shutter failure I'm afraid. FZ30 are not known for failing CCDs, but I've seen shutters fail on various lumix-es, so in this case I would suggest replacing the shutter. To be precise, replacing the shutter itself is a massive pain in the **** on this camera. It's much easier to replace the whole lens-it contains the shutter. You'll need to get a donor camera (ebay ;) and do the transplant. Swapping the lens is relatively easy if you're ok with midly fiddly things. Oh, and make sure you take notes which screws go where when dismantling the camera - and be careful with ribbon cables for the LCD.
Good luck,
Raf

SOURCE: My panasonic dmc-fz30 has dust inside the lens

How can you tell it's dust inside the lens? Does it show up in the pictures? And no, you can't take the lens apart to clean it because you don't have the precision equipment necessary to remount the lens elements within the close tolerances necessary.

SOURCE: I've had this camera for about three years and all

Try this...go into the menu and find "reset"...follow the on-screen instructions.