same here on a hp zt3000 (ati 9200)
it seem no solution at time.
in my case the unknown devices were the wifi card (intel 2100) solved installed the brand new vista drivers, and the sd card reader (solved installing the xp drivers from HP).

but for the 9200 nothing..
each tiem go in sleep mode i have the black screen, and the boot here is really really slow... ur too?