I have a similar issue, but it doesn’t seem to be related to the OS install. I get the black screen with blinking cursor after the fog menu. If I change bios and boot directly to the HD and skip the fog boot screen the pc boots fine. Of course this is not a solution for us as we have over 360 pcs that we need to be able to image or reimage monthly or quarterly (student lab). This setup was working fine on Thursday of last week, but on Monday all 360 pcs only boot to flashing cursor. Ideas?