Take out battery and memory card. Wait 5 minutes then return battery (no card at this stage). Switch on and you should get the No CF card message. /switch off, return card and make sure the card hatch door is shut properly. Should be ok as long as the battery is charged.
My 450D did this a couple of times and battery out seemed to sort it. My 5DII stopped talking to lenses the other day for no reason and battery out sorted that too. Think of it as the "have you tried turning it off and back on again" treatment for Canons...
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