eVGA 680i SLI: I have a problem during bootup

[Nirad9er]

for the past maybe 2 weeks, I've been having a problem during bootup. When I leave the computer off over night and turn it on in the morning, it will go through the bios post screens and right before it goes to the windows load screen with the bars, it wont do anything besides show a black screen. I end up having to reset the computer and it will post like normal through windows and everything. For some reason, it wont work the first time I turn my computer on. I have tried both the older P21 bios and the new P23 bios for the evga 680i SLI board.

anyone have any suggestions.

Thanks