Today I fixed a windows 10 computer that I overloaded from 3 hard drives to 10, I added a PCIe Sata interface and added 6 hdd and 1 SSD.
At first boot something broke in the power supply that prevented all UBS ports to have power. the computer booted completely in windows without any mouse or keyboard working. I restarted the computer and i could see that there was no USB input detected. and wasn't able to enter bios etc... After fiddling a little I replaced the PSU for a much stronger one and got my keyboard and mouse back, could access bios and mouse lights are on .
Alright, I thought great, it's not the motherboard... Boot into windows... Nada... No mouse no keyboard. No way to access anything to try to find was going on. I have not set any kind of remote access and probably should...
As a lucky guy, the mother board had a keyboard/mouse PS/2 port and it really saved the day. I was able to find out that Windows 10 in it's infinite wisdom, since no USB controller where present decided to remove support altogether. But worse, wasn't able to reinstall it after. Chkdsk, Sfc, Dism all found nothing...
I kid you not... I copied the USB.inf and associated files to their respective emplacement from a working one ( both files where missing ) and rebooted, tadam ! Everything is back...
Not sure what makes me mad the most... The stupidity of Windows... Or spending 2 hours finding a PS/2 mouse.