I just put a baader UV/IR cut filter in my 450D (previously had no filter in there). It didn't work when I put it back together. Just retrace your steps and check all the connectors have been pushed all the way in. I found one of the connectors was not pushed in far enough - that was enough to stop it from working. On dslrmodifications, there are also some videos - I found themuseful with a few of the connectors. Wasn't sure whether they were clip or just push-in connectors.
Chris
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