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When your computer shut down unexpectedly, it corrupted the Preview Cache database. Lightroom will rebuild this database file when ever it does not find a preview cache folder. In the folder where your catalog file resides will be a folder that is named after your catalog file. The Name will be something like "[YourCatalogFileName] Previews.lrdata" Delete this folder to force LR to build new Previews and rebuild the previews database file.
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