Q:

Unable to run 8 video cards GeoForce GTX 1060 on Windows 10 machine

About a month ago I built my mining farm with Windows 10 Pro and 8 video cards GeoForce GTX 1060, and it worked for some time. 
But after a Windows 10 update was automatically installed and the system was rebooted, Windows 10 found only 4 video cards (it shows only 4 cards in Device Manager/Display Adapters, and mining software works only with 4 cards). 
I have an impression that something was changed in Windows 10, because I did not change driver, BIOS settings, etc.. What Windows setting can affect this? 

MB: ASUS PRIME H270-PLUS
CPU: Intel Celeron
RAM: 4GB

BIOS settings:

Advanced\System Agent (SA) Configuration
Above 4G decoding [Disabled] -> [Enabled]
DMI/OPT Configuration\DMI Max Link Speed [Auto] -> [Gen1]
PEG Port Configuration\PCIEX16_1 Link Speed [Auto] -> [Gen1]
Advanced\PCH Configuration
PCI Express Configuration\PCIe Speed [Auto] -> [Gen1]
Advanced\APM Configuration
Restore AC Power Loss [Power Off]->[Last State]
Advanced\Onboard Devices Configuration
HD Audio Controller [Enabled]->[Disabled]
M.2_1 Configuration [Auto]->[PCIE]
M.2_2 Configuration [Auto]->[PCIE]

A:

It was not a Windows problem, raisers power cable was damaged.