After using my Panasonic Lumix DMC-TS2 in the ocean, my front buttons, including display, delete (/quick view), playback, video record, and all the centre buttons do not work. I can't press any of them, along with my zoom. The on/off usually works, same as my shutter button. It is supposed to be waterproof ( including saltwater) and drop proof, and other stuff.

SOURCE: Video playback problem on lumix dmc tz3

I don't have a solution to the first part of your dilemma (why it won't playback) but I do have a solution for deleting the file.  On your camera are "hidden" file folders.  When you connect your camera to your computer, you probably only see two folders (that's all I see for my DMC-LZ8).  But there are more, and your undeletable picture/video is in one of these folders.  Find the folder and you'll find the file.  Delete it from your camera using the computer to do the command.  Problem solved.  Okay, so how do you find the hidden folders?  I have a Mac, so my process was this:  1) Connect camera to computer; 2) Select/open camera icon (looks like "volume disk"); 3) From top Finder bar, select File then Find;  4) Select the camera volume to limit your search to the camera (not HD or other external hard drives you may have connected to your computer); 5) Select "Kind" and in the next dropdown button "Folders".  Voila.  Happy searching.  My hidden "undeletable" video files were in a folder called "100_PANA".  I selected them then moved them to the Trash.  Be sure to eject your camera properly (don't just turn it off or disconnect it).
Good luck.  I hope this helps.
PS - My theory is that this occurred after an upload to my computer got unexpectedly disconnected before everything finished loading or else the camera got disconnected from the computer incorrectly even if the upload had already finished (see above comment to eject camera properly).  In either case, the blank/black screen, unviewable but "there" on the camera taking up memory photos/videos problem happened to me, too.  The above actions resolved it for me.

SOURCE: Lumix DMC-FX01 Buttons not working

Remove the card and battery. Clean the battery contacts inside camera with a cotton swab lightly dampened with rubbing alcohol. Be sure battery is charged. Press all buttons on camera. Insert card and then the battery. See if it works. If you can now get into the setup menu, you can do a reset from the menu.

SOURCE: Panasonic lumix dmc-fz8 shutter button cracked

Hi dear, you can try to order the parts from Panasonic and do it yourself.
I strongly recommend you bring your camera to an authorized repair center to get it fix by them.Because it looks simple to open the camera but it's not.

SOURCE: On/Off Switch Doesn't work on Lumix DMC-FZ35

Unless you have the knowledge to dismantle and fix it, you need the services of a repairer. Sorry.

The Knight

• 76851 Answers
• Posted on Feb 07, 2012

SOURCE: where can i get user instructions for a panasonic dmc lumix fp8 digital camera

Hello
Chek chese links.
retrevo.com
www.pdf-manual.com/user-manuals-owners-instruction-guides-panas
http://www.dataentryjobs.us/67948.html
If you feel any difficulty in downloading the same, send your emai ID to me by Fixya comment box. I've the user manual to your camera, in PDF format, and I'll send a copy of it to you by return mail. OK.