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GA-H87N-WIFI - no video signal

GA-H87N-WIFI - no video signal
« on: May 09, 2014, 04:59:26 pm »
Hello,

I would like to create a mini PC based on the H87N-WIFI card. Only devices are a slim optical drive and a 2.5" HDD (both in SATA).
After assembly, the indicators light up and the fans turn, but nothing appears on the screen (no signal). The screen has only a VGA connector and is connected to the DVI-I port via an adapter.
I tried to boot from another hard drive with Windows 7, from USB and from a DVD, and the problem is the same (no post, no access to BIOS).
I would like to use a 80 watts PSU, but for testing I use a 400 watts PSU.
I have carefully tested the system : cables, CPU (a Core i3-4130T) and socket, RAM, ...

I then requested the replacement of the motherboard. I just got the new motherboard and the problem is exactly the same.

Can someone help me because I see no more solution?