sorry just relised you said that already about the board, why do you have another or was it an upgrade, or was it rma'd. well i say get event viewer going. get a new thread up or tail on this one what you get up.
also if you dare restarting the pc, go to properties of the hdd and hit disk check, im sure you know what that does, and will repair any ****** sectors other then that i think your going to hit a brick wall.
last resort is a computer shop that can run there monitor hardware on it! i know its not what you probably want to do but can you live with it, i know id chuck it out the window!!