Lev, would you please check if the SATA mode is set as RAID? If the SATA mode was not on RAID mode, once you change it, it would be necessary to reinstall the operating system.
Also check if your system complies with all the requirements http://download.intel.com/support/motherboards/desktop/sb/rapid_start_technology_user_guide_for_uefi1.pdf
Here is some information I found on Lenovo’s website. If you need to change anything on the BIOS, please uninstall the software previously installed. http://support.lenovo.com/en_US/downloads/default.page?
Then, download the software again and install it.