So yesterday I bought a brand new, 1,000W PSU to replace my 650W one and to allow for SLI. I install it and my second card (both are GTX 560 ti cards). I reinstalled my drivers and my system recognizes both cards. The control panel says "GTX 560 ti x2", I can select between them for Physx, sound output, picture output (although I only have one hooked up to my monitor), etc. But the kicker is I can't turn on SLI. Everything I've read says I'll get a balloon notification saying I can use SLI and the control panel will have a new section, etc, but none of those things happens. Anyone have any ideas?

System: Win7 Professional x64
2x GTX 560 ti
3.1 GHz Intel Core i5
1,000W Xion PSU
8GB RAM
(Can't think of my motherboard right now)

Note: My PSU and MOBO both say they're SLI certified and I'm using an SLI bridge.

Edit: Formatting changes