Beeps three times and shuts off

SOURCE: Turn camera on and it beeps twice then shuts off after 5 seconds

I Totally fixed my CAMERA!
If you turn on your camera, the lens does not come out, and it just beeps then turns off, then listen to me.
You need to unscrew the outer casing and take off the metal shell.
Hold the camera in one hand, palming it, looking at the LCD (ie the lens is pointing into your palm). This is to orient you.
If you look at the left SIDE of the camera, near the upper left corner of the LCD, you can peek through some of the windows of the black casing and see 2 PLASTIC GEARS. One is white, the other is black. These are the gears that actually move the lens in and out. All I did was give the white gear a good jiggle with the tip of a pen and evidently it made the teeth of the gears mesh together like its supposed to and .... VOILA .... the lens came out when I powered it on and all is well! I know this is gonna help someone!

SOURCE: The camera beeps 3 times on startup and then shuts down...

You have dirt trapped in the lense mechanism. use compressed air can to blow it out then turn camera off ans slap it into the palm of your hand a few times and turn on again to test if it has cleared. This is not a joke it actually works. Lots of these types of cameras suffer from this problem and I have fixed them using this method. Passed on By a Canon Tech!!! It certainly worked for mine . Be persistent some work immediately others take several goes of blowing and slapping face down

SOURCE: I turn camera on. Lens comes out. beep 3 times. turns off.

Everytime I try to turn it on, the lens comes out for about a second, the camera beeps 3 times, the lens retracts and the camera shuts off. The battery is completely charged and the camera is only 4 months old. HELPP :(