Unfortunately, the symptoms you've described, that remain after a hard reset and connecting the camera to the computer, indicates that an internal component, most likely, a connector to the control section, has failed. There are no other user level procedures available to remedy this issue. Professional service, at the link below, is the only option other than replacement.
Considering the age and present value of this camera, paying the cost of having it repaired (with a warranty) , approximately $240 really depends on how attached to the camera you are, but is probably a toss up. The standard "rule of thumb" is if the repair cost is greater than 50% of the value of the camera, it is not worth it. A good used or refurbished Panasonic DMC-TZ200 can be purchased on-line auction sites for as low as $140-$180 and I've seen new ones for under $250.
Please keep in mind that my diagnosis & solutions provided are directly dependent on the accuracy of your description of the problem. As with any "do it yourself" fixes, success is a "team effort", since I can't see or touch the camera, and relies on the customer's manual dexterity and ability to follow the instructions well.
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