MyWHY yakumo 55cx is constantly taking pictures without even pressing the shutter button. and I am unable to start the flash on, EV IS ALSO VERY LOW. PLEASE HELP ME

There is likely a short in the system.

Yes, but not in the Auto mode, where the camera decides whether or not it needs the flash. Switch to the P mode, which works like Auto except you have control over the flash, exposure, and other factors. See pages 26 and 42 of this manual.

You need to practice the correct shutter button technique. You need to press the shutter button half-way and wait for the focus to lock (it will beep) and then, when the moment is right, press the rest of the way for an instant picture with no "lag time".

Besides the auto-flash mode, you can select fill flash, flash off, self-timer, and nighttime-view with or without flash.
Press the MODE-SELECTOR BUTTON until the desired indicator appears on the LCD PANEL.
Fill flash and flash off modes remain selected after you take the picture. To cancel the selection, press the mode-selection button or close and reopen the lens cover/flash to return to the auto-flash mode.
Fill flash
When bright light indoors or outdoors comes from behind the subject (backlighting), dark shadows (especially on faces) may occur. Use fill flash to lighten these shadows.

1. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
2. Press the MODE-SELECTOR BUTTON repeatedly until the FILL-FLASH INDICATOR appears on the LCD PANEL.
3. Frame your subject within the VIEWFINDER EYEPIECE.
4. Partially depress the SHUTTER BUTTON. When the FLASH/CAMERA-READY LAMP turns off and the fill-flash indicator on the LCD panel stops blinking, fully depress the shutter button to take the picture.

Flash off
When you do not want to use the flash, especially indoors where flash is prohibited, such as in theaters and museums, or when you want to take twilight scenes or distant subjects that are beyond the flash range, or capture the ambiance of existing light, use the flash-off feature. Use a tripod or place the camera on another firm support, and use high-speed film because the shutter speed in these situations will most likely be slow.

1. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
2. Press the MODE-SELECTOR BUTTON repeatedly until the FLASH-OFF INDICATOR appears on the LCD PANEL.
3. Frame your subject within the VIEWFINDER EYEPIECE.
4. Press the SHUTTER BUTTON to take the picture.

Self-timer with auto flash
Use this feature to include yourself in pictures.

1. Use the TRIPOD SOCKET to attach the camera to a tripod or place it on another firm support.
2. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
3. Press the MODE-SELECTOR BUTTON repeatedly until the SELF-TIMER INDICATOR appears on the LCD PANEL.
4. Frame your subject within the VIEWFINDER EYEPIECE.
5. Press the SHUTTER BUTTON. The SELF-TIMER LAMP will glow and then blink during the last three seconds of countdown.
   • To cancel the self-timer selection before the shutter releases, close the flash.
   • The self-timer automatically turns off after the shutter releases.

Night-view with flash
In this mode, the camera balances the flash and existing light exposure so you can take beautiful pictures of people at sunset or at night. Use a tripod or place the camera on another firm support, and use high-speed film because the shutter speed at night will most likely be slow.

1. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
2. Press the MODE-SELECTOR BUTTON repeatedly until the NIGHTTIME-VIEW INDICATOR with flash appears on the LCD PANEL.
3. Frame your picture in the VIEWFINDER EYEPIECE.
4. Press and hold the SHUTTER BUTTON for 12 seconds without lifting your finger. Note: If you remove your finger from the shutter button before 12 seconds, the shutter will time out immediately.
   
5. After 12 seconds, release the shutter button to take the picture.

Night-view without flas
In this mode, you can capture the natural existing light of city-night scenes or fireworks at night. Use a tripod or place the camera on another firm support, and use high-speed film because the shutter speed at night will most likely be slow.

1. Open the LENS COVER/FLASH to raise the flash and to turn the camera ON.
2. Press the MODE-SELECTOR BUTTON repeatedly until the NIGHTTIME-VIEW INDICATOR without flash appears on the LCD PANEL.
3. Frame your picture in the VIEWFINDER EYEPIECE.
4. Press and hold the SHUTTER BUTTON for 12 seconds without lifting your finger. Note: If you remove your finger from the shutter button before 12 seconds, the shutter will time out immediately.
   
5. After 12 seconds, release the shutter button to take the picture.

in the take picture mode, press the button that has an image of the flash on it (the top of the circle) on the right, and keep pressing it until you've selected the image that shows the flash crossed out.

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[source]Question about Samsung Digimax S500 Digital Camera[/source]
Try replacing batteries (high Ah photographic type).
The lens motor & electronics may be draining power if Ah capacity has dropped too low. At night, it could be that your flash is trying to fire (another drain), or shutter timer / mirror staying open longer.

This has been a complaint on all of the Sony ''W'' series of cameras. They seem to do very well outdoors. Indoors is another matter. Under low light and flash conditions, the camera selects a slow shutter speed. This means you must hold the camera very steady or use a tripod. Here are some things to try: 1. Take a photo and instead of looking at the LCD, look at the body of the camera and your forefinger. Make sure that you are not causing the camera to dip downward on the right side with you press the shutter button. You should squeeze the shutter button between you forefinger and thumb. 2. Under low light and flash conditions always use the viewfinder instead of the LCD to frame your subjects. When holding the camera to your eye, make sure it is lightly touching your face. You head is steadier than two outstretched arms. If you can lean against a wall or something solid, do that too. 3. Under all conditions, use the two step shutter press. Press the shutter button half way down, then reframe your subject. Then press the shutter button the rest of the way down. That how the pros do it.

You are expecting too much for any auto mode. When shooting under low light conditions, the camera may take longer to achieve focus lock. If the subject is moving too, it will take even longer to lock focus. Try using manual focus for the conditions you described.

You are expecting too much for any auto mode. When shooting under low light conditions, the camera may take longer to achieve focus lock. If the subject is moving too, it will take even longer to lock focus. Try using manual focus for the conditions you described.