Graphic card fail to dispaly info on monitor

Hello,
everyone

i am having trouble to get data out out of my graphic card, i bought a new mainbored yesterday and once i changed the main bored my monitor doesnt show anything when its connected to graphic card but when its connected to mainbored onbord graphic card everything working just fine, during this failure monitor doesnt show anything since beginig and power light of monitor keep blinking all the time( all components works fine as the system work find with out using graphic card video out put) please help me what might casue this reason.

my email : aidin.jaf@gamil.com

thanks