Installed memory winodows 7 Ultimate no recoginizing

I preformed mainttenance on my Dell XPS 9100 that is to say to remove dust. When I started Winodows he recognized only 16 GB of 24 GB installed. I see in the system BIOS, but not in Windows. How could I fix this?

With the power cord disconnected and the sys dead for 15 minutes, I would like to reinstall the modules of

Tags: Windows

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