To boot, you need:
good mainboard, power supply, RAM and functioning BIOS and other firmwares. With no display, this can be any of them. You need to make sure the PS can provide the power output (current) and the RAM is the correct one in the right slot.
I reviewed the processor support for this board and noticed the board revision you have (405) requires a BIOS update to support the processor you are using.
The system needs to be updated before using the Intel® Core™ i3-4350 processor.
thank you for your answer.
Following your advice I spent time again to check every of them.
Everything is tagged as compatible with this motherboard, except for the power supply which is a brand new "Be Quiet! Straight Power 10 400W".
Given the flashing leds, I suspect that many things are OK (if there was a real show stopper, the led would be solid amber as per the manual); the absolute absence of VGA output signal is the strangest symptom: I suppose this should be the BMC output, hence independent from whatever hardware is on the MB except for the PSU of course.
I have few clues about the reasons why there would be absolutely no VGA output signal except for a faulty hardware (bad soldering, etc.).
If you have any ideas for that VGA problem, that would be great!
Thanks & regards,
Great hint, thanks.
Indeed, there might be a BIOS verson problem, as the MB is still "as is" and I did no BIOS upgrade.
The reason being, I could not have any video output from the MB, hence I am "blind" and I cannot launch a BIOS upgrade procedure (at least, not the ones I know which require some command line).
If there was a fully automated way of upgrading the BIOS without need for interaction, that would be a nice workaround.
However I would like to know: is it not possible to make use of the BMC subsystem (independent from the CPU, RAM, etc.) in order to do that BIOS update?
It took me some time but now I have solved the problem: I did purchase a new CPU, core i3 4330, because it was supported "without bios upgrade" by the motherboard.
I installed it in the MB, it did go further in the boot and post process, which was a good sign, but no VGA output, still had some random problems.
I did reboot several times, change the RAM module slot (because the POST leds told something about it), and finally after 3-4 tentatives the system booted completely until the EFI shell prompt.
Now everything seems to be working well.
Thanks for your support!
Note: I am just puzzled that a system with an autonomous BMC couldn't display anything if the CPU was not right... the system should have been more resilient, whatever the CPU/RAM etc. in my opinion (that's what a BMC should be made for, I guess). Anyway now it's sorted. Great!