Question about Canon EOS 400D / Rebel XTi Digital Camera

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Hi, my camera is a EOS 400D,my problem is the built-in flash it won't work lately since i switch to a 24x105mm lens. at first it was working, but when i tried to set it up to the different modes like the P,TV,AV etc. thats the time i noticed that it was not working anymore. it pops up but it didn't fire. i need your expertise thank you.

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  • Canon Master
  • 3,083 Answers

I read that custom function 8 turns the flash off, so I guess that should be checked first thing.
This web blog talks about a microswitch in the hotshoe that may be being held down by a spring or possibly stuck or broken:
http://www.bobatkins.com/smf/index.php/topic,308.0.html
If the camera is indeed equipped with the microswitch, you might try spraying some compressed air into it, in case some dust is not allowing it to make contact.
Of course, the zenon bulb, flash capacitor, or small step-up transformer could have gone bad, but those things usually last for years.
It could possibly be a slightly loose ribbon connector, but that would require disassembly to check.
I assume the flash is indeed turned on in the menu.
Other than those things, it might need servicing, which will probably be around $100. You might take the camera by a repair shop just to see what they say.
Good luck, hope this helps, and thanks for using FixYa.

Posted on Aug 31, 2010

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Posted on Jan 02, 2017

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My name is Madhu. I use the camera Canon EOS 400D / Digital Rebel XTi. When the inbuilt FLASH is on then a message pop up as "busy now", when i tried to click the camera to take a photo then...


Welcome to Fixya
Err 99 could mean several different things, such as... Memory Card, Lens or Lens contacts....

Here's what you can try:
Remove the memory card an enable "shooting with out memory card" and see if you still get the error. If it works your memory card is bad. Try another lens if you can. Clean the lens contacts with a pencil eraser (be careful not to get eraser dust in the camera body or in the lens). Worst case scenario is, Err 99 could be related to the shutter failing which would mean a trip to Canon.

Thank you

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yes..that's a twitchy button all right..can you inspect it to see if there's any accumulated dirt/grease can cause it to actually 'stick'

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I have a Cosina AF Macro 100mm lens that I used on


you should be able to use that lens with it. As long as it attaches to the SLR body ok. The thing to be aware of is with better technology in the newer camera you may have AF issues with that particular lens.

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I recently bought a used canon EOS 400d which was


Be aware that the built in flash does not pop up automatically in all picture modes. Try it when in the different modes (on the mode dial) and see what I mean. Does it popo up when manually opened ?, (small button on front left hand side of the viewing pentaprism/flash housing.)

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1 Answer

Canon eos 400d. card empty but cf light flashes red


Hi! Rachel, Mark here see if i can help.

Try different cf card see if it works.
Next if that worked or not take cf card place in computer & format card. Retry in camera.

Hope that fixed ya if not comment back me happy to assist you further. Good Luck! please rate.

Mar 15, 2009 | Canon EOS 400D / Rebel XTi Digital Camera...

1 Answer

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Can you pull it up manually, Be careful when doing this but try opening it manually, it is possible that the catch for the flash is just stuck temporarily.

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Sounds like your camera and your lens aren't communicating. Have you tried cleaning the contacts on the camera and the lens mount?

Sep 27, 2008 | Canon EOS 400D / Rebel XTi Digital Camera

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Here is a link which may help you.
http://forums.dpreview.com/forums/read.asp?forum=1031&message=9598105

It may be that the contacts on the lens is dirty, follow the directions, by using a clean pencil eraser (I would also suggest to use alcohol and clean the contacts after using the eraser). Also to remove the date button battery and the other batteries, then turn on the camera (with all batteries removed).
Then put the batteries back in.

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I made the mistake of putting ahotshoe protector from my old camera on the new EOS 400D. It stopped the flash from popping up. I took it off and things now work.

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