Lol, I`m know writing from my fathers portatable PC, so guess what happened to the real PC :)
It has been about 2 weeks and the service still doesn`t know what is the problem. First it was the memory cards, later it was the motherboard  and in the end  they said soething about HDD. Its a small firm, so no wonder how dumb they are. So know they say everthing is fine, but I checked and something is missing, lol, the power wire for graphic card :). So I need that wire to use my PC :/, but its real waste of time. How inconvinient they can get :)?