Double Screen Problem

[nexusartz]

Hi, before i told you my problem let me introduce my computer components 

 

MotherBoard : Asus Strix X99
Processor : i7 6800K
Ram : 32 Go in 4x8 KFA2 HoF 3200 Mhz
Graphic Card : GTX 1070 Kfa 2 Exoc Sniper
Watercooling : Corsair H100i V2
Power Supply : EVGA 650 GQ
Case : Corsair Spec - Alpha
Os Now : Windows 10 Last update (Cd Key bought on website)
Os Before the problem : Upgrade of W7 cracked in W10 but i was unable to do the W10 Creators Update

 

Now let me explain, from now that i have re installed my OS correctly with all drivers (graphics, Wi-Fi,  Bios...)

 

The computer won't work in double screen like he did before, the monitor i use actually is the Iiyama G-Master 24,5" Borderless connected by HDMI but it end with an HDMI to DIsplay Port adaptator (this one works correctly) and the other which is a Iiyama G-Master 27" connected in HDMI to my Graphic card.

 

Each one works alone but, when i try to connect both le  24,5" screen turn black till i disconnect the other HDMI cable from the 27" screen and the other (27") does not detect the source of the screen. but over all, i can't see where do the problem come from because i can't see in parameters which screen works because i got both Black.

 

That's all, i hope someone will answer,

Thank you

 

PS : Both monitors Works because i can connect a PS4 or Xbox One on them !