Question about Canon EOS 400D / Rebel XTi Digital Camera

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Canon 400d will not switch on

My canon 400d has just stopped working. When I switch it on the power light does not illuminate. I don't think it is the battery as it still has some charge left in it. I have had this problem before and even with a fully charged battery is does not switch on. any ideas?

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  • obsorb Aug 27, 2008

    hey i have the same problem! what should i do?



    the camera is totally new (not even a day in use) and i have been careful with the battery and all, what the hell happened. it worked at first

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I'm having finding a repair manual? Do you know of one?

Posted on Feb 20, 2013

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Open up the battery cover and look inside with a small flashlight. Are the battery connector prongs OK, are they sticking out evenly, and are they not bent? Make sure the battery connections are clean. Try another fully charged battery, because the one you have may be defective and even though it's fully charged, it might die down under load.
Beyond that you'd have to crack open the camera to do any troubleshooting or even check the ON/OFF switch.

Posted on Aug 28, 2008

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It might be a problem with the battery connectors.
They might not touch the battery well.
another reason, it might be the battery is dead or the power button is not working.

Posted on Aug 20, 2008

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1 Answer

Canon 400d not starting


While there may be a number of causes of no power, the usual one is that the bottom right screw that holds on the back circuit board has come out and has shorted out a section of the circuit. Usually it blows the 'P' fuse on the front board, but depending upon were the screw ends up it could blow the flash and drive boards or damage a section of the rear main board.

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Have you tried cleaning the battery contacts in the camera with a cotton swab lightly dampened with rubbing alcohol? Are the batteries also 3 years old?

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Sometimes when i'm taking picture my flash wont stop blinking for a few seconds.


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The only way around this problem (as people in a photo think the photo has already been taken and looks away when the camera actually takes the picture) is to use a hotshoe mounted TTL Canon Speedlight (430ex or 580ex) which use an infra-red focussing beam.

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

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The camera is working again. I took out the battery, with the the on/off switch, off. I then swtiched the On/Off switch On. I then put the battery in ,and the camera turned on.It then gave me an ERROR 99. I then switch it off and on again, and it is still working.

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No power


This definitely looks like an issue with the Camera. I suggest contacting the Camera Tech Support immediately and request them to send the Camera to the service center. There are more Canon Rebel XTi owners, including me have experienced no-power issues albeit not exactly similar. More discussed here: http://www.fixya.com/support/t270989-xti_wont_power_up

I also do not think that any user action can fix this issue. Just call the tech support, and they may say that they never heard of this issue, please point them to this thread. Good luck.

Feb 21, 2008 | Canon EOS 400D / Rebel XTi Digital Camera

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