Just got two new cards (nVidia 7800gtx's). Plugged um both in, attatched that connector thing to both of them and installed a fresh copy of xp pro & video drivers. Once I install the video drivers it says my system is set up to run in sli mode do you want to enable it. Once I enable SLI mode it restarts my computer and when it comes back on my monitor blinks off / on basically everytime I click on something or do anything. Once I disable SLI it goes back to normal. Any suggestions?