Thanks for the instruction 

There is mention about battery too, under this link i posted for You.

Still very good platform, specially if You have i7-6900K or 6950X installed 

Never had this problem on my X99 back then, but You can check these solutions - https://www.easeus.com/computer-instruction/computer-keeps-booting-to-bios.html

Thanks for the update, MoKiChu!Writing it to let You know, that some of Us still use this platform, even though its older and not much profitable - power consumption/performance etc... compare to new ones.You are the Man! Thanks again and keep it up.