Casio Exilim EX-Z750 digital camera

Hi,
It is problem of ccd imager chip in DSC-T1 camera that gives you washed out still image after taking shot/ stored image, you may get live view correct in camera mode and movie but it saves taken still picture over bright etc.
Replace ccd imager chip by local camera repair shop to solve this issue.
Thanks.

First go to the SETUP menu and make sure that the PLAYBACK VOLUME setting is set to a value greater than 0. Try increasing the shutter speed of any photos as CCD's will notoriously produce grainy images on slow shutter speeds. Grainy videos will indicate poor light, camera shake during filming or moving too quickly so the autofocus cannot function correctly, or using too low a resolution and will be especially noticeable at 640 x 480 when viewed on a large high resolution screen. If all the above make no difference then you may need to get the camera serviced.

You think you can try photo recovery software to see if you can rescue the lost photos or movies, here are some you may rely on. Both programs can also recover videos and music.

Photo Recovery Software (for Windows)
Mac Photo Recovery Software (for Mac OS X)

Be careful: Before your pictures and videos are recovered, do not attempt to save more files to the memory card in case the original files(your pictures) are overwritten.

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.

while recording the movies or taking photos just increase the pixel rate( to some 720 x ..) then you will see the good clarity in television ...
take the photos in the full capacity of ur mega pixels you will get very good clarity then....

Sounds like you're using the "cine" setting.

Switch the camera on.
Move the "cine / photo" switch (it's just above the joystick) to the "photo" position (i.e. to the right).
Use the joystick to move between images.

Good Luck

The sliding button above the LCD display has three settings. You need to slide the button to the right, A camera icon for taking pictures, a movie camera in the middle and the green arrow on the left to view pictures and movies taken

Sounds like the focus mechanism, your camera will be a very light sound while focusing. this is totally normal and nothing is wrong with your camera the sound is a good thing it makes sure your photos are in focus :)

What is the Macro function used for? The Macro function allows you to take close-up pictures. Use the Macro mode when you are 8.4” to 19.2” away from your subject. Where is the Reference Manual for the D-390? The Reference Manual is located on the Camedia Master CD-ROM and is available in four languages (English, French, Spanish, and German. The manual can be viewed on your computer screen or printed on your printer. How can I get traditional photo prints from my digital camera? Most photo processing centers or digital printing Kiosks can make traditional photo prints from a digital camera. There are also many on-line photo processors which conveniently deliver prints by mail. You can also make prints yourself if you have a photo quality printer like the Olympus P-400 printer. Why are there so many quality settings? Different quality settings are used for different purposes; for example, lower quality settings can be used to e-mail pictures because of its small file size. Higher quality settings are used for printing photo quality images. What settings should I use to get the best picture quality? The best picture quality setting on the D-390 is SHQ (Super High Quality). The SHQ file is the largest of all four quality settings. The image file size is approximately 786K. What is the video output used for? The video output is used for viewing images from your camera to a TV. A slideshow can be accomplished by using the camera hooked to the TV or recorded from a VCR. When taking macro images, can I use the viewfinder? Since the viewfinder sees the subject different than the picture taking lens, we recommend using the LCD monitor screen for taking macro pictures. The image previewed on the LCD monitor will be the exact image that is taken. How do I make a Panorama picture? You can easily make panorama pictures with your D-390 by “stitching” together multiple pictures. First, activate the panorama mode on the camera by selecting Mode Menu - Camera - Panorama. Take your pictures while making sure to overlap the edges of the images. Download your pictures to a computer and then use the “Panorama” function in Camedia Master to stitch them together. For more detailed information, please refer to the camera documentation. What is movie mode function? The movie mode function allows you to record short movie clips. The recorded movies can be played back or stored as still images using the cameras index function. Please note that the D-390 does not record sound in the movie mode. Can I add sound to a movie made with my D-390? The D-390 does not record sound in the movie mode. What is the best way to e-mail images? E-mailing pictures that were taken with your camera is as easy as attaching a file to your message.