Canon 40d-dead

Give the battery door a push as you switch it on, it may not be detecting the doors closed correctly.

Other than that it probably needs a trip to Canon.
 
Sounds like the DC-DC board has blown, basically a fuse and voltage regulator

Went on my one after about 65K clicks, all in one repair price at Elstree including service and sensor clean was 152 quid
 
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