Afterwards, I installed Windows 10 (over Windows 7) on my SSD. First start was ok, keyboard and mouse were working fine. I shut it down and came back hours later to discover that I cannot input anything anymore with any keyboard.
I tried every USB port I have on my desktop : none of them works.
I read reckon that it could be drivers : I unplugged the SSD since Windows 7 is still installed on the other HDD. Doesn't work either.
Also tried PS/2 ports : doesn't work.
So I am stuck at BIOS password I set up for the first time a day ago.
How can I fix this?