Hello I just buyed some seller one computer. I tested it i played about 20mins and its got freeze in show display but i cant do anything power button not work its can only shutdown in cable and then normally turn on and play 10minute. And the windows says me uknow ram 8gb have but only 4gb avaible, thats it ? i have processor on X3450 ram are ecc 8gb and some shit graphcis card can some one help with this?