When i turn on my canon powershot SD1400 IS the lens opens all the way and there is nothing that is clearly stuck in it, then the lens goes back in immediatly and a black screen with "lens error will shut down automatically restart camera" on it, i have no idea how to fix it. please help meeee!

Try these procedures: http://www.fixya.com/support/r13011856-lens_error

check the battery door switch - may sure the little flippy arem is not broken, or has been pushed out of the way so it is not operated by the battery door

The lens is cross threaded. Short of a trip to a camera repair shop, which would run what a new camera runs, you could try manually moving the lens out and brute force deftly applied to push the lens over to get it back on the correct threading is about all you can do.

Copy and paste this website into your browser for solutions:

http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html

Here are some troubleshooting steps 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: http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html
Think you're going to first have to go directly to step 7 to unbend the lens barrels.

canon powershot sd1400 wont turn on and its not the lens

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.

Remove the battery and replace the SD card . The SD card could be contaminated.

The problem is related to the mechanics in the optical image stabilization. There are 2 plastic ball bearings inside the shutter/lens module that can pop out of their round holders that are held in by 2 springs. This can occur by simply dropping the camera with the lens extended. I fixed many of these particular models and would not recommend an amateur attempt the fix as the complete lens has to be disassembled. A very poor Canon lens design.