This is the cure for toshiba laptops going black after bootup. (Originally posted at http://www.petri.co.il/disable_uac_in_windows_vista.htm ) Option #4 is probably the easiest to try to explain over the phone. This is the cause of black screens after login on Toshiba laptops running Windows Vista!! Although UAC clearly improves the security on Windows Vista, under some scenarios you might want to disable it, for example when giving demos in front of an audience… Read more »