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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Re: Canon 400d will not switch on
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.
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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.
Also check to make sure you do not have bent CF pins - if the center power pins are bent and touch other pins they might blow the circuit. Usually this blows the 'K' fuse under the lower right shield plate on the rear circuit.
The 400D uses flash assisted focusing. In low light conditions the auto focus cannot get a focus lock so it pops the flash a few times so the lens has a chance to focus. You will notice this will go away when in the manual focus mode (the switch on the side of the lens).
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.
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.
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.