COM ain't gonna show something

Hi guys, i really getting headaches with this problem. I just recently got a new motherboard, a Gigabyte 81945GMF. When i turn my system on, it runs, without any BIOS beeps, but it does not display anything on the monitor. The guy at the shop tested it out for me, and it works perfectly, but at home when i try it out, it ain’t gonna do its magic for me. Someone help me…

Desperate

Why don’t you ask him how he got it to work?