regards the Sleep mode issue, last night something happened and the pc can go to sleep mode and wake up in a 1 second!.
using windows 7,
strange but i know that the reason behind this was the IDE port!
i changed my old ploxtor 16x DVD "IDE" to samsung DVD drive "SATA" and the sleep mode fixed! with the last bios "ASUS P6T D. v2"

i don't know if this will fix your problem but i think if you had an IDE Drive connected try to unplug it and try.