Re: Asus Sabertooth 990FX motherboard problem with 560Ti
I disabled IOMMU in the BIOS and it booted without USB and ethernet and it didn't get to a desktop.
I powered down, drained the BIOS for around 10 minutes. Booted with default settings which came up with IOMMU disabled - failed to boot.
Had to play with BIOS settings including enabling IOMMU to get it to boot back to the old state where X only starts with the vesa driver.