This reminds me of the wake from Sleep problem that Intel P67 chipset boards have. In that case, the video card (actually the driver) does not respond (become active) within the time period that Windows expects, which is considered an error and you are left with a black screen. That seems to be related to the PSU taking to long to wake up. The ironic thing was this happens with high quality PSUs, cheap ones seemed to not have this issue.
Look for an option in your BIOS called "Check Ready Bit", which apparently overrides the Windows threshold for checking the system's response. That option should be enabled.
If you don't have that option in your BIOS, or it doesn't work, then you may be out of luck. You may be able to get Nvidia to look into the issue.