Canon powershot sx120 is wont turn on - Canon PowerShot SX100 IS Digital Camera

SOURCE: lens error, restart camera for canon power shot SX120 IS

This is probably THE most common failure among digital cameras. There's a halfway chance of fixing it yourself, described here:
http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html

SOURCE: My PowerShot SX120 IS keeps showing a e41 one

Use a card reader to download to a folder you create on your desktop.

SOURCE: my canon powershot sd 1200 wont turn on.

Hi,
Check whether your batteries are actually making contact with the battery posts, and that these posts are clean. If not, bend the posts up/down a little, and maybe clean them with a little rubbing alcohol on a Q-tip. Or if that does'nt work our for you , if your camera uses Compact Flash, check to make sure all pins are present and aligned in the card slot (if bent, simply unbend/straighten them with a skinny "jewelers" screwdriver, then insert the flash card for final realignment).

Thank you !!

SOURCE: canon powershot sx120 si depletes battery life in

Camera likely has a short, remove the batteries before a circuit completely shorts out and then you'll have no power. You just need to have the camera serviced. The site that is real good for the powershots is: camerasandparts.com In fact, all they do is service for the powershot models, they're amazing if you need help with one of these. I think yours would fall under a power issue and for that model it's only $89 including parts / labor, complete service for the camera, plus the return shipping if you're in the US. They're tough to beat for service for these, they are the place if you need help with a powershot, good luck with the problem.

SOURCE: I dropped my camera and the LCD cracked and does

You can, they have the part at www.camerasandparts.com That site exclusively service the Powershots and supplies parts for the Canon models. If you want them to do it, it's $89 for parts, labor and the shipping back, plus they do the complete service on the camera which is nice too. If you need help with one of these, that site is excellent. Good luck with the problem.