I have received brand new pc from pc specialist but when i swich it on i get a no display signal when pluggin in monitor i have an aoc 27inch gaming monitor and the graphics card installed is the xfx rtx r 580 8 gb but i will not be touching any of the components insid since i am not that confident in doing that i paid 800£ for pc and am very upset that is quite alot of money for me. Pls help