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as far as i think VISTA is not compailant with the CANON software. since vista s a latest version CANON will have to release a new version of its software for VISTA. so this must be requested with CANON.
Did you accidentally press the DISP button on the back of your camera? This manually turns the screen on and off to save batteries. Try pressing this button one more time to see if it turns the screen back on.
Your camera only can use SD cards. The SDHC is a newer generation of SD cards, that need a different protocol you access the files. The newest version is the SDXC version.
SD cards never exceed 4 Gbyte. The SDHC never are bigger than 32 GD and the SDXC are over 32 GByte.
When you try to buy a SD card, the biggest you will find will be 2 GByte. I own 2 SD cards that have 4 GByte, but even I can't find them on the net any more.
The cards are from Platinum. But I even can't guaranty you the 4Gbyte will work in your camera.
Some firms used to bring out new firmware, as soon as the SDHC cards came out. I succeeded to update my TomTom to SDHC and the old thing now even accepts 16 GByte cards. But Canon did not offer an upgrade for the V550, so you stay stuck to the normal SD cards.
The reason this occurred is that you likely never formatted the card in your camera. The card will work fine in the beginning but eventually will corrupt. AFTER you've recovered the photos, format the card in your camera to prevent this from happening again (press function, select tools menu, select item stating your card's memory capacity, then follow the prompts for low-level format). Keep in mind formatting will also totally erase your card, so again only do this AFTER you've recovered the photos.
possible solution: Remove memory battery (little gray cap next to the AA batteries. Got CR1220 stamped on it) and put it back in. This should do a reset. When you switch the camera back on it should ask for the date/time. Hope this works for you.
The problem could still be within the batteries, digital cameras are very demanding. For example, if an alkaline battery stops working in a camera, very often the battery is still plenty good, and will work fine in other devices such as a flashlight. So before you give up on it try a brand new quality battery, I like the modern rechargables.
The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.
Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo cataloging program such as Picasa.
sounds like either a stuck aperture or you have the camera in manual mode and you need to adjust the setting of either the shutter speed, aperture, or the iso... try just putting your camera in auto and see if yuo still have the problem... if it is taking good pics at night then it is you aperture if you are in auto.. if it does not take good pics at night then it is a bad ccd