The strange thing is that this issue doesn't occur under Windows 8, the only problem is that my drivers bug out when I enable SLI on Windows 8 which is why I reverted back to Windows 7. I'm running the GTX580 3GB version in SLI and it works perfectly on Windows 8 up to driver version 310.70, anything higher and it doesn't work properly when I enable SLI, it works fine without though. I will definitely be reverting back to a single expensive card instead of SLI when the next series arrives. Under Windows 7 EVERYTHING works correctly aside from the issue in this thread, 10-20 seconds of a black screen after the "Starting Windows" part of booting. As I stated before the computer responds because I hear the music and I can also type my password and log in (I also hear the login sound play) but the screen stays black for roughly 10-20 seconds and then appears perfectly fine. All my games run without any issues (aside from the SLI issues in Tomb Raider, which are now solved in 321.14) and I have no complaints whatsoever about anything aside from this. There is an issue with my headset where it continually disconnects and reconnects the USB but this has been confirmed to be caused by the Logitech Gaming Software and can be found on their forums.