Story: I bought a laptop asus n76vb with installed win8. In bios menu i change params Secure boot Enable->Disable Launch CSM Disable->Enable After installed Win7 i have little problems with video (nvidia 740m did not show up in Device Manager. Drivers for nvidia gave an error during installation) And then I made the fatal mistake. I updated bios from 201 to 205 and reset cmos to defaults (by f9 in menu) And now paragraphs "secure boot", "launch CSM", "uefi/legacy" is gone. Downgrade bios to 201, 202 versions not solve the problem. I need to turn off "secure boot" any price.