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Sometimes, if that lens has heavy use or if it has been traveled with a lot, several of the internal zoom screws may come loose deep inside the lens and cause the zoom to freeze. It requires a complete disassembly of the lens to reach the screws and re-seal them so it does not happen again. Bob Kilbourn www.camerarepairs.com
The Auto-Focus on the lens is damaged. I have had the exact same problem with my 18-55 and I ended up buying a new one because I take shots at weddings and I can't afford to manually focus each photo. You can still use it if you switch the small knob to MF and then use the focus ring for manual focus.
This usually happens when the contacts between the lens and the camera are dirty. Try taking the lens off and cleaning carefully the metal contacts on the camera and the lens. If that does not solve the problem, you can get a warranty repair or replacement since that camera should still be under the original 12 month warranty.
I also have a 40D with exactly the same lens and fault. Over the course of a few months the lens became "sloppy" so if the lens was pointing towards the ground it began to creep. Towards the end it dropped to its full extent. About 10 days ago it locked up completely and I was unable to zoom at all. Returned to Canon as mine was just in warranty and they have fixed and returned it within 7 days. Very effecient even sending me a text message to say that it had been dispatched. The lens is now just like new and I only hope that this is not an annual trip.
Bottom line; I am an engineer by profession and I wouldn't touch it with a barge pole. To do these properly you need special tools and jigs to make sure things line up properly. It also needs to be done in a "CLEAN" environment.Do yourself a favour and leave it alone.
Since the problem is limited to this lens, I highly doubt that you would have to replace the cameras AF sensors.
Since you only have the problem with this lens, I am afraid that you will have to get the lens repaired. Is the lens also 3 years old? Did you get it with MACK extended warranty?
Sometimes, Canon do these kinds of repairs for free, if they discover that there was some manufacturing error that caused it to fail. So be sure that you get it to a certified canon workshop.
I hope this helps,
something sounds strange about this. aperture 00 is an invalid aperture value. stands to reason if that is the case the camera would complain about it. via error code. being that its only six mos. old i would give canon a ring.