Wait a min, first yes the temps are reallllyyyy high, you have to do SOMETHING about that, but that 'blue halo' if its what you are saying, like you still see the screen but there is a blue tint on it, its most likely a bad connection. what i mean is try wiggling the cable in the monitor a bit, and around the video card, and make sure its plugged in properly. if you still have that same problem try a different cable. (i had it happen to me a little while ago , and i was scared my monitor broke or something, but someone on here told me about it being a connection issue, and when i tried that i found that the cable just wasn't plugged all the way into the monitor, because i moved it around to watch a movie from my bed.... and the able was loosened.)
as for the sli, make sure your case has enough airflow over the two gpus (it would help if you can get something blowing straight on them because you want to move the hot air above the bottom card away from the top card) also in afterburner set higher fan speeds, even if its loud try to set it so that if the cards get above 80C you put the fans at 80% or something and IF they get to 90C put those fans at 100% speed so that you don't fry anything.