Sometimkes motherboard manufacturer's mess around with a motherboard's BIOS settings (for w/e reason) before they sell it.
I've seen this happen many times. Depending on w/e BIOS setting they mess with...it can cause all kinds of weird problems.
/e Btw, this is what it says in his motherboard manual...

I don't know what version of 64 bit Windows he tried. But it shows that there is a setting in the BIOS, that could be causing the problem.
This post was edited by Ghot on Aug 2 2017 09:31pm