I have the same problem since the last weekend, but at my site there was no power outage.
I start the CCM with the recovery CD and select the option fm. After this I press y for the for the force file system integrity check. The System check the Harddisk but found no error. I see again the error message Block bitmap for group 128 is not in group. (block 8388608) Unexpected Inconsistency; RUN fsch MANUALLY. without -a or -p options.