User Guide for Canon 1000D / 1D / 1D Mark III / 1Ds / 40D / 450D / 500D / 50D / 5D / 5D Mark II
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If there is insufficient charge left in the camera battery, the camera cannot communicate with EU...Either replace with a fully charged battery or use the AC adaptor kit provided with your camera...Your computer does not supply power to the camera through the interface cable......
If you do not perform any operation while the camera and computer are connected, depending on the computer system, a confirmation message may appear on the screen asking whether you wish to continue communicating with the camera...If you do not perform an operation while this message appears, communication with your camera is discontinued and EU shuts down...In this case, turn the camera’s power switch to < OFF >, then again to < ON > and start up EU......