Gigabyte aorus 5 gaming not posting

Sep 2, 2018
3
0
10
Computer has been running fine for several months.
Come back from weekend away and it won't boot.

Disconnected al devices besides 1 stick of ram, and cup.
Monitor connected to onboard graphics
Power switch from case plugged into board.

When I power on the psu, the motherboard less blink on and off.
When I press the power button on the pc case to power on I hear a click, but nothing happens.

If I plug a mouse or usb hd, the less on those devices will come on.
If I plug in an Ethernet cable, the led for the slot will come on

 
Sep 2, 2018
3
0
10
cpu: i7-8700
Mobo: gigabyte auros gaming 5 z370 v1.0
Ram: corsair vengeance ddr4 8gb x 2
Ssd: 960 evo m.2 500gb
Gpu: 2x gigabyte gtx1070 g1 gaming
Psu: corsair rm850i
Os Windows 10

Psu is 6 months old