dark lord of tech

Hi, I need help regarding a switch with I have recently bought from a local seller, In a thought that an L2 switch will help me getting networking fast and secure I have purchased the above mentioned switch, everything seems to be fine but the problem I have is I am not able to used all the 8...

The graphics card is broken the hdmi and display ports dont work, if i sell it how much do u reckon i can get out of it, i originally paid $750 aud for it, also there is a missing backplate too.