I just bought a new motherbard and CPU and reinstalled 11.04 from scratch.

When i click on sleep, the computer goes to sleep but If i press the wake up key, any other key or the mouse, the computer wont wake up. If i press the power button it seems to wake up but both monitors remain black and nothing happens.

How can I troubleshoot this?

New CPU: Intel i7 2600K
Motherboard: Asus p8z68-v lx