Not understanding this. If the manufacturer of that board has installed a VGA port on the board, which according to the manufacturer's website they have, why would they then not put the components, AKA a graphics chip, on the board to support that port. Seems counterproductive to me and certainly stupidly wasteful, money and resources wise, to the manufacturer. Oh and don't worry about making "dumb mistakes" Matin (your words not mine) everybody makes them including those that are supposed to know what they are doing including me. the problem is not making dumb mistakes. the problem, from your point of view, is not making the mistakes but in not knackering the expensive stuff you have by making those mistakes. From our point of view people who ask for help must be extremely clear in what they ask for and how they interpret the advice given and how they answer the questions asked. We all have our own ways of diagnosing faults. Usually they work for us but not, necessarily, for anyone else. And don't think for one minute that every single poster on this and every other help forum hasn't had their major disasters. We have and we will. We were all learners once and where technology is concerned we are ALL still are. It is extremely difficult to interpret fault symptoms and to diagnose faults when you have the kit and the test equipment on the table in front of you. When you are diagnosing remotely, as on the web, then it becomes infinetly more difficult to impossible.
The reasons for the advice that I have given you is that I have looked at the board on manufacturers web site and I have gleaned certain information from that website and based my advice on that information. Of course I could have looked at the wrong board or the manufacturers specifications could be wrong, they do, rather stupidly in my opinion, differ from country to country. At the moment you have a board the will not perform a basic function, ie it will not display. Without a display everything you have is useless. Because a display on a computer is basic to how that device is used it is vital to go back to basics to fault find the board. that means removing everything that is not required to actually make the board give a display. You will, or should, get a display as soon as the board is powered up and that display comes from the bios (Basic Input Output System) note the basic. If you get a display with the board out of the case with only CPU, RAM and power supply attached then we know the board, RAM and CPU are okay. If you cannot do that or that board will only display if you have to add very expensive components (GPU) then the only way to fault find it is to start throwing different bits of expensive add ons to it. Fault finding then becomes extremely expensive.