Trying to get my cards to SLI or what-not

Alright so I'm used to upgrading my computer but i've never done two graphic Cards. Anyway I have two GeForce 7600 GS 512 DDR, And I'm trying to dual them. I've already installed the latest driver, They are SLI Compatible. I tried doing it already but the moniter doesn't show up, I switched it from Normal mode to SLI and used the little bridge thing, and nothing. The motherboard I'm using (in case) Is "abit fatality"

Anything I'm missing here? Why won't the monitor show a picture?

*Also* When trying to get both cards to work at the same time, I think about half way ( dunno can't see ) half way from powering up to hearing the windows starting chime, There is the 2 second beep, which in the booklet means there is something wrong with the product, but its the same product I've used, and they are securely fastened.

Jam it back in, in the dark.