im having this exact issue, motherboard is intel BLKDH61WWB3 1155 and processor is g840. 775 motherboard on customer broke and i had to upgrade, geovision card is a gv-650 v3.51 60fps . the card shows a black screen on all channels when a camera is connected, i putted win7 64 no luck, xp sp2 no luck. still black screen. i tested the card on my Gigabyte GA-G41M-ES2L with xp and the channels were ok.. at the end i had to give the customer an old 775 motherboard =(. can some one tell me if there is a list of uncompatible motherboards for geovision cards? i knew that via and ati chipset were the bad boys but its too strange that intel is incompatible too. ps. i changed the motherboard twice so its definately an incompatibility issue.