Asus Sabertooth x58
3GB Crucial Ballistix Tracer 1600 DDR3 (There's six more on the way here from an RMA)
EVGA GTS450 GPU
XFX 650w XXX Series PSU
Thermaltake SpinQ VT CPU cooler
Samsung 1.5TB HDD
Seagate 250G HDD
Lite-On Blu-Ray Drive
Windows 7 Pro 64-bit
Got a second GTS450 today. Installed the card, plugged in the SLI bridge, and fired up the computer... Waited for the notification that this computer is ready for SLI... nothing. Okay, maybe it doesn't do that notification in Win7. Opened up the Nvidia control panel, went to the 3D settings. It shows two cards, but nothing showing that SLI is enabled or any way that I can see to enable it. Went through the computer making sure all connections are secure, still no change. Removed the SLI bridge and uninstalled the drivers for the video cards, restarted, windows reinstalled the drivers, I updated them to make sure I have the latest release, restarted again, shut it down, replaced the SLI bridge, and turned it back on... still nothing!
The video cards work fine (I've tried my monitor on each of them), both PCIe slots are okay, what else could it be? Anybody got any ideas?