I have had this happen once along time ago but not to this degree. I tried to change the resolution setting on a new PC with a new 19 " LCD monitor and it went to signal out of range. I rebooted and when it booted into windows the screen went blank and I got the floating box out of range. I could boot into safe mode but could not change anything in the settings. I finally had to hook another monitor up and go into windows reset the settings and shut down. Then I hooked up the new monitor and I was able to boot in to windows with no problem. If that happens again where I can't get into windows and don't have another monitor what can be done? Thanks