Lutfij :
Did you uninstall your GPU drivers before removing the GTX1060? You should then reinstall the drivers after populating the system with the GTX1080.
For the sake of relevance, list your specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
I didn't uninstall the drivers. I was gonna put the specs but forgot.
CPU: i6-6600k
Motherboard: Msi Z270 sli plus
Ram: 16x2 3000Mhz corsair
HDD: WD 1TB 2012 / SSD: Force MP500 120GB
Gpu: Gigabyte 1080 Windforce
Psu: EVGA 500
Chassis: NZXT S340
OS: Windows 10 home