Long Boot-Upwith SLI

Due to SLI not being supported properly I had been running only 1 770m. I re-enabled SLI last week and now my boot up times have doubled.
My screen shows the BIOS part, then goes black and stays there for 20secs, then continues as it would normal.

Any ideas if there's something wrong?

Thanks

Long Boot-Upwith SLI