Can anyone help me with this issue:

I have a rig based on the rampage extreme II. core i7 cup 920@3.8Ghz, 6GB RAM, 2 750GB HDDS in a Raid0 configuration and 3xGTX285 GPUs in an SLI configuration.
Windows 7 Home Premium 64bit is installed.
I would like to use standby mode. But unfortunately the rig does not wake up when I restart from standby. It won't boot but it powers up (no boot screen though - the display remains black [no signal]).

Does anyone have an idea how to solve this (hibernate works though)?