Re: PC won't wake up from hibernation.
Did you try seeing if your old nVidia drivers are uninstalled? It may be causing some conflicts with hibernation if they are not.
Also, is the graphics card all the way plugged in and are both pci-e power plugs in?
Have you tried turing hibernation on and then off again?
Checked jumper settings and the like?
Checked your wattage and make sure you have enough to run a card as big as the 5870?
Do you have any software on your computer that might cause it to not come out hibernation?
And have you checked other forums and the web too see if this problem is common and if so, how it is fixed.
XPEX Vortex 3620 Mid Tower, Rosewill 450 Watt PSU, MSI P6N SLI Platinum 650i, Intel Celeron D 356, 2GB G.SKILL DDR2 800, Western Digital 40GB, (2) EVGA 7950GT 256MB Video Cards in SLI, HP DVD Multi-Burner, Windows XP.