NO LCD IMAGE / LENS STUCK

Try the following steps when the lens is stuck and will not open, retract, or extend.

1. Turn the power off, eject the battery pack, and reinsert it into the camera.
2. Turn the power back on and check if the drive part of the lens moves properly.
3. If the lens still will not open, retract or extend, then reset the camera.

It is jamming, the only really fix is to have it repaired, that costs a lot and it is sometimes better to just replace the camera.

problem with the lens,not with the lcd,the image fomation is bad,so replace the C.C.D

Canon Powershot's error E18 has to do with the lens:
If it appears on a black LCD with E18 written on the corner, it is mostly due to the lens getting stuck while trying to extend. The camera will beep a few times and the LCD will display a little E18 in the lower-left corner. The lens gets stuck in the extended position, and refuses to move either to focus the lens or to retract when powered off.
I am giving below a link which will help you with E18 problem.

http://www.e18error.com/repair.html

Hope this helps, let me know if you have a proble.

You can Try the following also;
Remove the batteries from the camera, wait a few minutes. Put a fully charged batteries back in and turn the camera on. if it doesnot work then,

2: Remove the batteries again, as also remove the memory card. Then install the newly charged batteries, when you turn it on it should come back to life.
3: Insert the cameras Audio/Video (AV) cable, and turn the camera on. Inserting this cable ensures that the camera's LCD screen remains off during the start process. Thus extra battery power is available to the camera's lens motor during start up. This extra power can be useful to overcome any grit or sand particles that may be jamming the lens.
4: Place the camera flat on its back on a table, pointed at the ceiling. Press and hold the shutter button down, and at the same time press the power-on button. The idea is that the camera will try to autofocus while the lens is extending, hopefully seating the lens barrel guide pins in their slots.

Try the above and let me if its any help.
Please do rate and thanks for using FixYa and Best fo luck to get you camera out of E18!

Canon Powershot's error E18 has to do with the lens:
If it appears on a black LCD with E18 written on the corner, it is mostly due to the lens getting stuck while trying to extend. The camera will beep a few times and the LCD will display a little E18 in the lower-left corner. The lens gets stuck in the extended position, and refuses to move either to focus the lens or to retract when powered off.
I am giving below a link which will help you with E18 problem.

http://www.e18error.com/repair.html

Hope this helps, let me know if you have a proble.
Please do rate and thanks for using FixYa and Best fo luck to get you camera out of E18!

Lens errors (E18 errors on Canons) 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 some things that you can do to try to correct it. They only seem to work for less than 50% of the lens errors, but if the camera is out of warranty, they're worth a try:

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

Hi
Had the same problem a few months ago.There was a high pitchedwhisltle and I think the screen said "lens fault.turn off camera" or something similar.Bought a G9 to replace as the 7 was out of guarantee but sent the 9 back to the e-bay reseller as it was obviously secondhand with grit around the lens ring and the viewfinder.Ebay never again!.So 3 months ago ago I tried the G7 again with a fresh charged battery before I consigned the camera to the loft.I noticed that each time i switched on the whistle and message was there but the lens extended slightly further each timeso I kept rebooting until the lens was fully extended.Turned the camera off and on again and everything was back to normal.It seems that this may be Canons protocol when a camera goes back.Its been absolutely fine until today.It wont boot up at all.I have tried 2 fresh charged batteries and its dead.Any ideas anyone?

The following blog outlines some repair options for a lens error:

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

The shutter in the lens is stuck closed. You need to take the camera to a shop where they will replace the lens assembly.

there may be two reasons for this problem. 1. may be a defective or broken CCD. 2. the shutter is not working may be due to broken flex circuit cable. in any of the case you have to get it fixed from a professional camera repairer