Need to reset powershot a620 after opening it

Here's an article I put together for repairing lens covers. Good luck, and try to keep track of where each part goes.

First try pressing the DISP or DISPLAY button on the back of your camera. If that didn't fix it... A stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, sometimes with lines, especially when taken outdoors (for shutter stuck open). To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see this link for further info and a simple fix that may help.

My A620 JUST started doing the same exact thing last night. LCD works, lens works... but something possibly wrong w/the shutter so it won't open.. everything black.

Check your owner / user manual. I had similar problem and it was caused by "Mode" and "Flash" settings.

You can turn on/off the digital zoom. While on shooting mode, press MENU button and go to left end tab menu items. Navigate to "Digital Zoom" and select the desired¡red setting: ON or OFF. Remember that digital zoom can't be used if the screen is turned off.

you need tape a nail file and some rocks now scratch the lens with rocks and file it then tape it so i can see

Remove your batteries and look inside the battery compartment. Notice that there should be three small phillips screws at the bottom of the compartment. Tighten up all of these screws.

Don't even try unless you know what you are doing - you can get a nasty belt off a charged flash capacitor (around 300volts) - the lens is more than likely clogged up with sand, this will wear the sliding tracks in the zoom very quickly and will render it useless.
You can buy new lens assemblies (Colchester Camera Repairs) but the cost will be high, around £80.00 just for the part.

Does it zoom ok? If so the AF motor has got stuck. Same old compact camera zoom lens problem.. buy an SLR.

Remove batteries Try gently rocking it side to side back and forth. Then in the area around the switch try flexing the casing whilst rocking- It may just pop up.