My samsung camera s760 gets on and samsung logo appears but after logo it appears black and my lens also not going inside.

Try these procedures.

The non functioning of the camera can be a fault in the shutter, zoom or auto focus sections and may be due to the failure of the Main control system or the drive. A simple was is to reset and we can try by removing the battery and card for some time. Now replace only the battery and while switching power ON, tap the lens hood on the palm of your hands so as to disengage any dirt or mechanism being struck.
Use some air to blow between the lens to dislodge any sand particles struck inside. Unless you are familiar with handling of small devices must the camera be opened. If so check the voltage on the motor drive, check the auto focus and Zoom drives, it must be free with manual movement. If jammed the motor can be removed and released. If none of these works then you can think of taking consensus with the service centre.
Get estimate before you decide. It will be good to have it checked at the authorised service as you do not have to run around for spares.

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My Samsung Camera Lens is Dont Open i dont Know Why .!
i can describe that Thing ..> When im Going to activate The DigitaL camera in Work The Lens is Open in half no at All and do one Noiz like dont have enought Battery But i Charge the battery 5 days to Proveee that in Camera but this thing Didn't Happend
Tell mee why and what can i Do to haveee again My camera :D and to do Photos

You may have gotten a light debris in the lens. Just the littlest amount will cause the lens to jam. Try a can of compressed air and blowing it out.

your camera is damaged to no return.

Yes.

You may need to go to the Samsung website, follow links to support and/or downloads for software updates which support your camera and Winvista.

If it's a lens problem, there's a halfway chance of fixing it yourself, described here: http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html

it may be because of your mode setting, go to menu den mode and set it to normal and maybe you wong get it in black

Lens is probably just stuck because of debris or misaligned gears. The lens can many times be repaired without having to replace it. It's probably misaligned gears inside. Try to return to manufacturer. If you're out off warranty, there are third party place that fix them such as camera lens repair. There are also free camera repair guide website that show you how to replace the lens, the part is usually available on ebay.

did you check if your battery is dead. When batteries are dead, your lens sometime get left out.