My camera is canon ixus 105.i cannot turn it on.the lens is not coming out.its says "lens error will shut down automatically Restart camera".what should i do.?thanks

Here's a video covering troubleshooting steps for this problem.
and here's a page summarizing the above steps.
http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html

"Lens error, restart camera". Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ...Here's an article and here's a video that shows some things that you can try that may (or may not) correct it. They only seem to work for less than 40% of the lens errors, but if the camera is out of warranty (or repair cost approaches that of the camera), they're worth that try. Some of the later steps do involve some risk to the camera, so carefully weigh your options before deciding to conduct them.

Try moving around the lens GENTLY. If does not help, call Canon, they will probably fix or replace it.

You may have gotten dirt or dust into the lens mechanism. Sometimes an air cleaner can help the situation.

There is something wrong with your lens barrel. It can be anything from some sand/dirt that got inside in which you try using some canned air to blow out the particles while continually turning it on and off. Usually what it is from is the camera being dropped, even if it is in a case or inside a bad. The jostle or direct impact of the fall will break some small gears or tweak the lens off of alignment. If it was from an impact then you lens barrel needs to be replaced and in that case the repair cost are usually as much as getting a new camera. You can send it into Canon and get it repair for a flat rate. Sorry about your camera.

hi if your lens looks bad like crooked, then you have to send to canon. They don't sell lens unit to local repair shop. but not serious problem (lens repairable) then bring to local repair shop. canon will charge you about $135, local repair shop would charge you $65 Thanks and good luck with you!

Hi,

Checkout this tip about digital camera error messages


Lens Errorfix for Digital Camera

heatman101;'
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It always comes because there is something loose inside the lens, such as a screw. These articles maybe helpful for you: Lens error, E18 error and turn the power off and on again Good luck

Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ... Unfortunately, many cameras that fall prey to this can only be corrected by professional repair. But, here are some things that you can do that may correct it. They only seem to work for less than 40% of the lens errors, but if the camera is out of warranty, they're worth a try.

So when its stuck you just push on the lens.
i know it sounds crazy, and it'll sound like you cracked it, but it really does unjam your camera!
try it!