When I turn on my camera the blinking icon for the battery keeps coming on. I've changed the batteries, so I know its not because of the batteries. What else could it be?

All electronic cameras have an internal battery to keep settings intact. Most are not easily replaced.

Whether the lens is coming outside or not ? and what is the color of the blinking light ? if its red then Your camera could either have a lens error or other problem. YOu need enough battery source to run your digital camera. Change the battery on your coolpix and let me know.

Battery is broken, replace the Nikon Coolpix 3100 Digital Camera Battery Bar: http://www.2deals.net/Digital-Camera-Battery/Nikon/Nikon-Coolpix-3100.html

kindly format you SD card first then try again to take a picture .

Is the battery door maybe not closing tightly, causing the metal area that touches the tips of the batteries to not be in close enough contact with them? This happened with my camera due to a cracked battery door, and until I can afford to replace it, I've put a rubberband around my camera over the little door to hold the batteries in tightly! Surprisingly, this is working for me! I know it's not an optimal fix, but thought I'd offer the suggestion. (You didn't say what make/model your camera is.)

It is now over seven years old - if it has been used extensively, it may just be worn out.

Same Problem, same day, have you found any solution?, i stored the camera for abut 6 months following the Manual specifications, keeping the camera away from humidity, dust, even light and unmounted batteries, but it didn't turned on when i really needed it, I tried changing batteries, power source, i've already checked the lock/standby and the main dial, anyone help please!

The battery is worn out - replace it.

As Suzaku explained:
A battery icon will show up on the LCD screen of your camera when it is already low and needs recharging. It can be found at the lower right side of your LCD screen. The ready light of your camera will also blink red and your camera will turn off if the battery is exhausted.
NOTE:
The icon will not appear if the batery is sufficient and there is no TECH way of making the icon show until the batt needs charging.

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