My machine fails to wake (power comes back on, fans going etc but no windows) from sleep. It then needs a reboot to get it going again. The weird part is that my motherboard, cpu, memory, graphics card (Core 2 Duo E6400, 2 gig of corsair xms-2, Abit F-I90HD MATX motherboard with onboard Ati x1250 graphics) worked fine in my antec sonata case with Vista Ultimate but when i moved the components to a new Antec NSK2400 case and did a fresh install of Vista Home Premium on a new hitachi hard drive i can no longer wake from sleep mode. All the settings appear the same in power management, so maybe it could be PSU related? Anyone had/having similar problems?