If I install the last version of Bios the pc only shows 8 gb of ram.Found this info in this link https://forums.tomshardware.com/threads/windows-10-only-using-half-of-installed-ram.2558441/
Also saw where this was a bios issue on a Gigabyte H170 board, Do you have the latest Bios?
I'll do that, thanksAlso you could run Memtest86 Memtest 86 http://www.memtest86.com/technical.htm
Guide to using Memtest86+
https://www.wikihow.com/Test-PC-RAM-with-MemTest86 This runs outside of windows and if it shows only 8GB it is a motherboard issue.