mobo black screen

Jun 22, 2018
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i have intel dg41rq lga 775 mobo not working the fan and cpu working but nothing wrong on the monitor only black screen i changed the psu after 1 month from the problem and its worked i used it for 2-4 weeks and i changed the psu and it didn,t work i changed the psu again and nothing wrong there is no beep or something else only black screen what is the problem and what should i do
pc spec

intel pentium e5700 2010
intel dg41rq
2gb ram ddr2
sorry for my english