I wouldn't recommend hardware accelaration all the way down, I'd say a notch bellow the full accelaration is normally best, but you should play with it.
What all do you have installed/running ? you've mentioned IG.. do you have any USB hardware ? Do you have any other applications running while hibernating ? (Besides Winamp/RR) ? Normally this issue of RR not resuming properly from hibernation is hardware related (usually drivers that were written without proper handling of hibernation) -- You can try to find newer drivers, unplug devices and see how that affects your hibernation process.