Intel/motherboard dg31gl
Motherboard do not give any display

I have purched an intel mother board from cost to cost computer on 18th march.but now there is aproblem in my motherboard it does not give any display on monitor the invoice no. is =M-RI/146970 company vat tin no.07640315079.

mother board detail are given as

BOXDG31GL

AA E33912-200

BTGL83800LY8

BT89704189N1849

Please check the detail. now i want the replacement order for my motherboard

thank you